Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

One of the longest wooden benches in the world snakes around Geneva's Treille Promenade.

This modern museum of Mediterranean culture is surrounded by a surreal concrete honeycomb.

Erotic art covers the walls of the largest ancient pleasure palace.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Pompeii's less famous neighbor is still revealing her secrets.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

Stone Age solar temple is aligned with the sun on each equinox and solstice.

The chefs at El Diablo use heat generated by an active volcano to cook the food.

Visit a surreal landscape so otherworldly NASA actually used it to train the Apollo 17 crew.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

France's most famous cemetery, with some of its most curious tombs.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

One part local history, 99 parts gruesome haunted house.

High Victorian fantasy created a fairytale castle out of a ruined fortress in Wales.

Medicinal spa created with the discharge from a geothermal energy plant.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Northern Ireland's Brobdingnagian stepping stones.

A theatre built to house the rowdy Oxford graduation ceremonies became the stage for a debate about God's existence.