The Waitomo Glow Worm cave.
Mesmerizing Son Doong cave in Vietnam is believed to be the largest cave in the world (around 9 hours from Hanoi)
Son Hang Doong, the World's Largest Cave, National Park Phong Nha Ke Bang, Vietnam. Photography by Ryan Deboodt, via
Benagil Caves, Algarve, Portugal (This is one of the places I'm considering moving to!
Ancient Inca Stone Staircase, by Kurt Gordon Photography