Underwater art project will double as a massive artificial coral reef to help regenerate the damaged ecosystem.

Visiting this cacophonous collection of vintage novelties is like stepping into the mind of a crazed toymaker.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

A jaw-dropping "megalibrary" that turns book-browsing into a geometric adventure.

The famous artist couple lived and worked here, in two different houses separated by a bridge.

Extraordinary sculpture garden created by an eccentric English poet.

Part bookstore, part café, and part forest.

Frida Kahlo's childhood home, now a museum of her life and works.

Balanced rock sculptures pay tribute to a murdered conservationist and his pioneer wife.

This abandoned hospital is one of the most haunted places in Costa Rica.

Once the foundation for a mansion, these ruins now offer amazing panoramic coastal views.

A secret climbing tree hides along the side of a Costa Rican road.

These mysterious ancient stone spheres were created by a civilization lost to time and are now mostly lawn ornaments.

Where dogs like the rare "Fire-Tailed Border Cocker" run free on the mountainside.

This Costa Rican topiary park is a surreal garden of unearthly delights.

Sloth rehabilitation center in the jungle of Costa Rica.

Slather on the history at an exhibition dedicated to this Russian luxury.

Once frequented by heavyweights of the Russian arts scene, this café is stuck in the 1800s.

A tea party concludes each visit to this Russian spice cookie sanctum.

Immortal combat in a Moscow museum.

Thirteen sculptures in central Moscow graphically depicting vices of the modern world.

It's hard to believe the dizzying patterns covering this abandoned mine are completely natural.

Dr. Strangelove-esque tours reveal the inside a bunker once reserved for Stalin himself.

This ancient village and its adjoining cemetery have a beautiful history of death and remembrance.