These azure waters were thought to lead to the Mayan Underworld.

Three tiny islands in a Portsmouth pond are at the center of disputed land claims from a number of competing micronations.

Winter and summer solstice aligned sculpture in the middle of nowhere.

This crab paste noodle soup specialist has been doling out its namesake dish for more than four decades.

This Vietnamese bar doubles as a multistory labyrinth.

This cryptic monument honors a mysterious dead woman, despite her identity being lost centuries ago.

This unassuming bookstore in the heart of Madrid is one of the oldest in Spain.

A 1930s Art Deco swimming pool with a design inspired by grand ocean liners.

This cozy café is housed in a repurposed pharmacy originally built in 1927.

This 11th-century temple gave rise to the word "juggernaut," as well as some mysteries that defy scientific explanation.

A honeycomb-like structure of interlocking shelves creates a beehive of books.

A 19th century library favored by Edgar Allan Poe and H.P. Lovecraft, known by locals as "the Ath."

A small island with shimmering pink sands, home to loggerhead turtles and rare plants.

The world's oldest known salt mine.

During World War II, Austria's oldest salt mine was used to store thousands of pieces of stolen artwork.

Lebanon's highest point offers expansive views, martian terrains, and eerie ski lifts.

A meandering boardwalk across the bogland leads to a "stairway to heaven" with sublime views.

A quasi-futuristic roof sits atop a medieval Bohemian monastery damaged during World War II.

A replica of an early 19th-century vessel that sailed across the world.

The crypts are so large they're basically their own underground church.

In the palace with a thousand doors, not all of them are guaranteed to lead you somewhere new.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

At this bohemian accommodation, guests who dream of joining the circus can spend the night in themed wagons.

Local history holds that a young woman, killed for a crime she did not commit, cursed this island.