Noirish green neon marks the location of one of the oldest private detective agencies in France.

Standing atop 2nd-century Roman ruins, this church is one of the oldest and most iconic in Old Cairo.

Slum Settlement Filled With Mountains of Garbage.

Part shoe store, part sociopolitical art gallery, part zoo.

The massive cave church of Cairo's Zabbaleen community is one of the largest Christian churches in the Middle East.

An alien landscape of chalk-rock in the Egyptian desert.

A massive work of modern art that appears to be a crop circle in the middle of the desert.

One of the most well-preserved temples of ancient Egypt.

One of the most poignant ruins of the Chernobyl nuclear disaster, the local football team's stadium has been quickly reclaimed by nature.

18th century anatomical amphitheater of the Royal College of Surgery of Barcelona.

Barça football fans might see the insignia hidden in a church window as a divine sign.

The oldest giants in Catalonia are now displayed in a 14th-century Gothic church.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

One of the largest collections of socialist realist art shows the surprising depth of the official art of the Soviet Union.

This historic Chinese tower was said to have been haunted by fox spirits but is now haunted by a grisly murder.

Pilgrimage site for star-crossed lovers.

This immaculate and historic water garden culminates in a massive stone dining table with an inset fountain for chilling the wine of the Cardinal's guests.

These "anatomical machines" are only one of the many strange items in this Italian crypt.

An eclectic collection of thousands of items owned by the sculptor Frederic Marès.

Turntable anonymously received orphans, alms, and groceries.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

London's largest outsider art museum.

An unusual round church in London with a Templar past.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.