Abandoned railway line circling the city of Paris.

A gruesome combat between a hunter and a furious momma bear.

A majestic lion statue guards this Parisian botanical garden, and feeds on an unsettling item.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

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

The first green space constructed on an elevated viaduct.

A tribute shrine where the Space Invasion street art movement started.

An underground city of ancient quarry tunnels hid thousands of Allied soldiers in WWI.

This triumphal arch celebrating the Sun King's conquest of Lille is a masterpiece of military architecture.

This monumental mural crafted nearly 40 years ago is still in perfect condition.

An unsettling sculpture of a boy hanging out in a street in Ghent has been baffling visitors for years.

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

Eighty million natural history specimens call this gargantuan museum home.

This tree was grafted from the actual tree that led Isaac Newton to ponder the theory of gravity.

Named after a lodging site that existed nearby, a bridge has existed at this location since 1455.

A giant wooden soda bottle pays homage to a distinctly British drink on the very spot where it was invented.

Have a seat with the father of modern computing at this Manchester monument.

After protestors toppled a statue of a 17th-century slave trader, the pedestal where it once stood remains unoccupied.

An ornate doorway leads to the former site of one of the city's oldest society of merchants.

This Grade II Listed Building with an Art Nouveau façade once contained a unique print shop.

17th-century merchants in Bristol nailed their deals by placing money on these pedestals.

The unusual clock on this 18th-century market building has an extra minute hand for "Bristol time."

Designed to celebrate the queen's 40th birthday.

A miniature replica of the canine that became the logo for a large recording company.