Albert Einstein's head sticks out of a snail shell stacked on a rocket in this truly bizarre monument to the scientist.

The world's tallest church tower reveals a spectacular view to anyone up to the task of climbing the daunting staircase.

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

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

An eerie, derelict amusement park in Berlin.

One of only two commuter aerial tramways in the United States.

Elevated freight railway turned wildly successful urban park.

Traditional 11th-century outdoor tannery.

An awe-inspiring mosque in Morocco with one of the tallest minarets in the world.

God's Saharan sandbox of wrath.

A fortified city, home to a remaining population of five families

The other side is actually green.

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.

Mosaics, storks, and brothels—this ancient city has it all.

One of the most spectacular canyons in the world.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

Giant topiary dog once played a role in a terrorist bomb plot.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

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

This cobblestoned medieval-style town was entirely constructed in the 1990s and 2000s.

A memorial to a Swedish hockey player's "encounter" with aliens.

Swedish skyscraper with a 90° twist.

According to legend, this boat-shaped henge is built over the grave of a mythic king.

This chimerical bridge/tunnel appears to dead end right into the sea.