This museum explores how a 1973 volcanic eruption forever changed this small Icelandic island.

Designed as a labyrinth, this subterranean prison was crafted without bars or doors.

The history of the treatment of mental illness, illustrated in all its gory detail, and housed in an asylum.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

The burial place of one the greatest Arthurian authors, with the sword in the (grave)stone.

A 100-year-old Japanese command center is now a unique underground university walkway with periodic exhibits.

This huge pile of volcanic boulders hides a stunning network of secret grottoes.

Could this controversial parietal bone be the remains of the famed French philosopher?

Italian horror legend Dario Argento’s own shop hides a sinister museum-dungeon in the basement.

This bizarre residential building is the masterpiece of Von Jour Caux, the “Gaudí of Japan.”

Roman ruins top white travertine terraces formed by ancient hot springs.

An architect transformed this abandoned cement factory into his castle-like workshop.

One of the world's steepest streets seems to have houses sliding down it.

The eccentric mansion of one of the most popular horror authors of modern times.

A peculiar family mausoleum built by a German nobleman captivated by the occult.

This unique structure allowed boats to bypass underwater mine barriers in the channel to enter the harbor.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

Rare wooden escalators lead deep down into an otherwise staggeringly monotonous tiled tunnel.

Remains of an abandoned coral city.

An exotic jungle hideaway run entirely by indigenous Kichwa women.

A Surreal flight of architectural fancy in Vietnam's Central Highlands.

An eccentric garden of sculptures crafted in India decorate an Irish green space dedicated to Alan Turing.

A preserved oasis with traditional Andalusian-style architecture and beautiful views of the Nile.