Compare, read reviews, research & book your next Contiki, Intrepid, G Adventures or Topdeck 18-30's guided tour with Global Journeys. You must be aged 18-35 to travel with Contiki, 18-29 with Intrepid, 18-39 to travel with Topdeck and 18-38 to travel with G Adventures. Browse through our tours around the world to find the holiday just for you. We've made it easy!