This modern labyrinth lies in the shadow of a ruined medieval castle.

This amazing abuela became a diehard metal fan late in life and an icon of Madrid's '80s rock scene.

An underwater restaurant, surrounded by a coral reef.

A cluster of granite granaries perched on stilts.

Fiji mermaids, mummified remains, and recreated cryptids are among the morbid oddities at this Maryland museum.

One of the largest ochre quarries in the world, hidden in a limestone landscape.

A charming Spanish village sits atop this natural limestone overpass.

Crossing this suspension bridge feels like walking through the sky, a fitting tribute to the head of the Apollo program.

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

A mysterious spot where the laws of gravity seem not to apply.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

A floating underwater hotel, created by a Swedish artist.