Smoked mummies housed in mountainside caves.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

This Japanese-inspired labyrinth of hot springs is hidden in a Chilean forest.

Once described as the "Eagle's Nest," this ruined ancient city rests on a remote mountaintop.

This historic stone bridge has an entire neighborhood clinging to its sides.

This subterranean necropolis holds three floors of antler-dug grave caves.

This tiny island protects a number of rare bird species by only allowing visitors to set foot on the beach.

The remains of this ancient fortress atop a manmade hill look as though they were built into a volcano.

While not Turkey's deepest underground city, this subterranean redoubt is the largest.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

Hidden behind musical flora and forgotten for over a thousand years, this cave is now a neon dream.

The forbidden island of the Tuscan Archipelago may still contain buried treasure.

Two stunning 17th-century libraries and a cabinet of curiosities.

A collection of anatomical samples from one of the first anthropologists to suggest that humans reached North America by crossing the Bering Strait.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

The largest Neolithic ruins in the world hide a notably clean prehistoric metropolis.