Stunning examples of Russia's 18th-century wooden architecture.

The shallow, salty inlet was a safe haven for 19th-century pirates.

The most unloved grain elevator in Brooklyn was a “Magnificent Mistake.”

Abandoned blockhouses from Nazi Germany's Atlantic Wall erode into the sea on a French beach.

A Borgesian work of art that may blur the line between fiction and reality a little too convincingly.

A former mental hospital founded in the 1930s by a eugenicist who advocated for the forced sterilization of patients.

A nightly tradition fills the streets of Flogsta with a collective scream.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

The pits used to load the nuclear bombs onto the aircraft that dropped them over Hiroshima and Nagasaki at the end of World War II.

An abandoned hotel in the highlands of Bali is shrouded in stories of ghosts, curses, and corruption.

The now-overgrown beach resort was once frequented by Yugoslav military elite.

On a small Puerto Rican island, banks of secret naval bunkers lie abandoned and filled with piles of office equipment.

The once-grand remains of this resort are slowly turning into the strange ruins of the future.

The ruins on a deserted tropical island in the Philippines bear the scars of WWII.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

Stay in a room with a view... of the bottom of the ocean.

Secret Swing.

America's post-nuclear-attack chambers of Congress.

This extensive nuclear fallout shelter built from 42 school buses could house 500 people in its tunnels.

Visiting dignitaries and Hollywood stars once stayed at this 1920s hotel, alongside ghosts that are said to haunt its corridors.

A backdoor to Machu Picchu that only the most foolhardy infiltrator would attempt to breach.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

This faux-seedy Japanese arcade is made up to look like a maze of alleys straight out of a cyberpunk dystopia.