32 Offbeat Cruise Excursions That Go Way Beyond Sightseeing

19. Explore a 5,000-Year-Old Underground City in Turkey

If your cruise includes a stop in Kuşadası, Turkey, don’t just visit Ephesus—venture into the Derinkuyu Underground City, one of the most fascinating archaeological sites in the world. Carved into volcanic rock 5,000 years ago, this sprawling city extends 18 stories underground, with tunnels, hidden escape routes, air shafts, and even ancient wineries. Originally built as a refuge, it’s a real-life labyrinth waiting to be explored. Pro Tip: The tunnels can be narrow and steep, so skip this one if you’re claustrophobic.