Arrive in Istanbul and transfer to your hotel.

Depart your hotel for an enriching guided walking tour, during which you will explore the Hagia Sophia, formerly a church before becoming a mosque and finally a museum. A beautiful example of Old-World architecture, this museum showcases lovely Christian murals and Islamic symbols throughout. After the Hagia Sophia, visit Istanbul's similarly beautiful Blue Mosque, named for the Blue İznik tiles that cover its interior. For those who are interested, be guided to the lively Grand Bazaar and venture through the market before returning to your hotel. (B)

Excursions:

• Istanbul Walking Tour

Admire the grandeur of the spectacular Ottoman Sultans' Grand Palace of Topkapi, home to every Sultan from the 15th-19th centuries. During your tour, marvel at the private chambers of the Sultans, the Harem (women's quarters) and the Imperial Treasury's vast collection, including the jewel-encrusted Topkapi Dagger and the stunning 86-carat Spoonmaker's Diamond. (B)

Excursions:

• Topkapi Palace & Harem

Embark your ship in Giurgiu. Tonight gather on board and meet your fellow passengers. (B/L/D)

Excursions:

• Hotel check-out
• Flight to Bucharest

Experience the best of Bucharest, Romania's capital, known as the “Little Paris of the East,” with its wide boulevards and Arc de Triomphe. Then visit Bulgaria's ancient capital, Veliko Tarnovo, with its medieval fortress and multiple orthodox temples. You can opt instead to explore Rousse, known for its 19th- and 20th-century Neo-Baroque and Neo-Rococo architecture, and then afterwards visit the UNESCO-designated Rock-Hewn Churches of Ivanovo with frescos revealing exceptional artistry of 14th-century paintings. (B/L/D)

Excursions:

• Bucharest excursion
• Veliko Tarnovo excursion OR Ivanovo Rock-Hewn Churches & Rousse Highlights

Explore Vidin, one of Bulgaria's oldest cities, and surrounding areas with a choice of excursions. Discover Baba Vida Fortress, the largest preserved medieval castle in Bulgaria. Continue on to Belogradchik, one of Bulgaria's natural wonders, where you can hike around its most spectacular rock formations. Alternatively, visit a local home for a demonstration of traditional Bulgarian yogurt and Banitsa, a pastry you will also get to make. You also have the choice to bike through Vidin and to the castle. (B/L/D)

Excursions:

• Belogradchik & Baba Vida Fortress OR Banitsa pastry and yogurt tasting OR Vidin bike tour of Vidin

The Iron Gates is one of Europe's most awe-inspiring natural wonders. The Danube narrows as it winds through a series of magnificent gorges between the Carpathian and Balkan mountains, forming a natural border between Serbia and Romania. The ancient Serbian king Decebalus is proudly carved into the mountainside and always captivates travelers. (B/L/D)

Excursions:

• Full-day scenic cruising

Explore Serbia's capital, Belgrade, on a city tour, which includes the Kalemegdan Fortress and the Serbian Orthodox Temple of St. Sava. Alternatively, visit the Royal Palace, the official residence of the Serbian Royal Family, and the House of Flowers, the mausoleum of Marshal Tito, who became the first President of Yugoslavia. Or enjoy a taste of the region by sampling Serbian plum brandy, Šlivovitz, and delicious local delights at the Quburich Distillery, followed by a panoramic tour of Avala Mountain. Later in the day, choose from a hike to Kalemegdan Fortress, known for its winding walking paths and incredible river views, or join a guided bike tour. (B/L/D)

Excursions:

• “The City by Two Rivers” tour OR Belgrade Royal Palace & Tito's Memorial tour OR Quburich Brandy Tasting & Avala Mountain Fortress Hike OR Belgrade bike tour

Vukovar is a Croatian symbol of resistance, which you'll better understand on your city tour showcasing the Ovčara Memorial and Eltz Castle. Alternatively, choose a wine tasting in Ilok, a center of wine production since Roman times, where you'll sample its famous Grasevina, Traminac and Frankovka wines. Back on board, cruise to Novi Sad, sometimes called the “Serbian Athens.” Discover Novi Sad on a walking tour to Dunavski Park and through Stari Grad, the Old Town center. If you prefer a more active exploration, join a guided biking tour or hike through Fruska Gora National Park. During the evening, visit Petrovaradin Fortress, a mighty stronghold no enemy has ever breached. (B/L/D)

Excursions:

• “The Athens of Serbia” walking tour OR Serbian Specialties Tasting OR Petrovaradin Fortress hike OR Novi Sad bike tour
• Vukovar City Tour with Eltz Castle OR Croatian wine tasting

Enjoy a scenic morning cruise to Mohács. You'll then visit Pécs, founded more than 2,000 years ago by the Romans. Visit the UNESCO-designated Christian Necropolis; St. Peter's Basilica, the city's main Catholic cathedral along with its catacombs; and Széchenyi Square, the heart of Old Town Pécs. You will also see the Mosque of Pasha Qasim the Victorious, one of the symbols of the city. Or for wine connoisseurs, you'll want to go to the Szekszárd wine region, one of the oldest red-wine-growing areas in Hungary, established more than 2,000 years ago. You may also take an exhilarating guided bike tour around Mohács. (B/L/D)

Excursions:

• Pécs excursion OR Szekszárd wine tasting OR Bike Ride along the Danube

Disembark the ship and enjoy a city tour of Budapest where you will see the UNESCO-listed Castle Hill district, Fisherman's Bastion, St. Stephen's Basilica and the Chain Bridge. Check into your Vienna hotel and enjoy free time to explore the city. (B)

Excursions:

• Budapest sightseeing tour
• Transfer to Vienna

The “City of Waltzes” offers a treasure trove of gems just waiting to be discovered on your city tour. See the majestic Opera House and the former Imperial Palace of the Habsburgs before concluding in Vienna's historic city center. (B)

Excursions:

• “Imperial Vienna” tour

Bid farewell to Vienna as you prepare for your flight home. (B)

Arrive in Istanbul and transfer to your hotel.

Depart your hotel for an enriching guided walking tour, during which you will explore the Hagia Sophia, formerly a church before becoming a mosque and finally a museum. A beautiful example of Old-World architecture, this museum showcases lovely Christian murals and Islamic symbols throughout. After the Hagia Sophia, visit Istanbul's similarly beautiful Blue Mosque, named for the Blue İznik tiles that cover its interior. For those who are interested, be guided to the lively Grand Bazaar and venture through the market before returning to your hotel. (B)

Excursions:

• Istanbul Walking Tour

Admire the grandeur of the spectacular Ottoman Sultans' Grand Palace of Topkapi, home to every Sultan from the 15th-19th centuries. During your tour, marvel at the private chambers of the Sultans, the Harem (women's quarters) and the Imperial Treasury's vast collection, including the jewel-encrusted Topkapi Dagger and the stunning 86-carat Spoonmaker's Diamond. (B)

Excursions:

• Topkapi Palace & Harem

Embark your ship in Giurgiu. Tonight gather on board and meet your fellow passengers. (B/L/D)

Excursions:

• Hotel check-out
• Flight to Bucharest

Experience the best of Bucharest, Romania's capital, known as the “Little Paris of the East,” with its wide boulevards and Arc de Triomphe. Then visit Bulgaria's ancient capital, Veliko Tarnovo, with its medieval fortress and multiple orthodox temples. You can opt instead to explore Rousse, known for its 19th- and 20th-century Neo-Baroque and Neo-Rococo architecture, and then afterwards visit the UNESCO-designated Rock-Hewn Churches of Ivanovo with frescos revealing exceptional artistry of 14th-century paintings. (B/L/D)

Excursions:

• Bucharest excursion
• Veliko Tarnovo excursion OR Ivanovo Rock-Hewn Churches & Rousse Highlights

Explore Vidin, one of Bulgaria's oldest cities, and surrounding areas with a choice of excursions. Discover Baba Vida Fortress, the largest preserved medieval castle in Bulgaria. Continue on to Belogradchik, one of Bulgaria's natural wonders, where you can hike around its most spectacular rock formations. Alternatively, visit a local home for a demonstration of traditional Bulgarian yogurt and Banitsa, a pastry you will also get to make. You also have the choice to bike through Vidin and to the castle. (B/L/D)

Excursions:

• Belogradchik & Baba Vida Fortress OR Banitsa pastry and yogurt tasting OR Vidin bike tour of Vidin

The Iron Gates is one of Europe's most awe-inspiring natural wonders. The Danube narrows as it winds through a series of magnificent gorges between the Carpathian and Balkan mountains, forming a natural border between Serbia and Romania. The ancient Serbian king Decebalus is proudly carved into the mountainside and always captivates travelers. (B/L/D)

Excursions:

• Full-day scenic cruising

Explore Serbia's capital, Belgrade, on a city tour, which includes the Kalemegdan Fortress and the Serbian Orthodox Temple of St. Sava. Alternatively, visit the Royal Palace, the official residence of the Serbian Royal Family, and the House of Flowers, the mausoleum of Marshal Tito, who became the first President of Yugoslavia. Or enjoy a taste of the region by sampling Serbian plum brandy, Šlivovitz, and delicious local delights at the Quburich Distillery, followed by a panoramic tour of Avala Mountain. Later in the day, choose from a hike to Kalemegdan Fortress, known for its winding walking paths and incredible river views, or join a guided bike tour. (B/L/D)

Excursions:

• “The City by Two Rivers” tour OR Belgrade Royal Palace & Tito's Memorial tour OR Quburich Brandy Tasting & Avala Mountain Fortress Hike OR Belgrade bike tour

Vukovar is a Croatian symbol of resistance, which you'll better understand on your city tour showcasing the Ovčara Memorial and Eltz Castle. Alternatively, choose a wine tasting in Ilok, a center of wine production since Roman times, where you'll sample its famous Grasevina, Traminac and Frankovka wines. Back on board, cruise to Novi Sad, sometimes called the “Serbian Athens.” Discover Novi Sad on a walking tour to Dunavski Park and through Stari Grad, the Old Town center. If you prefer a more active exploration, join a guided biking tour or hike through Fruska Gora National Park. During the evening, visit Petrovaradin Fortress, a mighty stronghold no enemy has ever breached. (B/L/D)

Excursions:

• “The Athens of Serbia” walking tour OR Serbian Specialties Tasting OR Petrovaradin Fortress hike OR Novi Sad bike tour
• Vukovar City Tour with Eltz Castle OR Croatian wine tasting

Enjoy a scenic morning cruise to Mohács. You'll then visit Pécs, founded more than 2,000 years ago by the Romans. Visit the UNESCO-designated Christian Necropolis; St. Peter's Basilica, the city's main Catholic cathedral along with its catacombs; and Széchenyi Square, the heart of Old Town Pécs. You will also see the Mosque of Pasha Qasim the Victorious, one of the symbols of the city. Or for wine connoisseurs, you'll want to go to the Szekszárd wine region, one of the oldest red-wine-growing areas in Hungary, established more than 2,000 years ago. You may also take an exhilarating guided bike tour around Mohács. (B/L/D)

Excursions:

• Pécs excursion OR Szekszárd wine tasting OR Bike Ride along the Danube

Disembark the ship and enjoy a city tour of Budapest where you will see the UNESCO-listed Castle Hill district, Fisherman's Bastion, St. Stephen's Basilica and the Chain Bridge. Check into your Vienna hotel and enjoy free time to explore the city. (B)

Excursions:

• Budapest sightseeing tour
• Transfer to Vienna

The “City of Waltzes” offers a treasure trove of gems just waiting to be discovered on your city tour. See the majestic Opera House and the former Imperial Palace of the Habsburgs before concluding in Vienna's historic city center. (B)

Excursions:

• “Imperial Vienna” tour

Bid farewell to Vienna as you prepare for your flight home. (B)