Jesus' footprints and the first catacombs in the world.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

The yawning maw of this pagan visage is said to bite off the hands of liars.

An alchemist's "magic door" stands in the middle of a Roman park.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

This charming candle shop has been in business since 1789.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

A closed London rail station created to cart away the dead still bears the marks of attempts to make it less morbid.

A makeshift shrine to the late rock star is still kept up on the nondescript façade outside 1 Logan Place.

This wildly-tiled artist's palace is a living and growing account of the creator's life, loves, and labors.

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

Rebuilt remains of a temple to Roman god Mithras.

A tongue-in-cheek arcade where the games are based on everyday life.

A student driver's nightmare.

One part local history, 99 parts gruesome haunted house.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

A hands-off space for graffiti artists to hone and display their skills.

An unusual round church in London with a Templar past.

Banksy gives themself artistic license with this piece of London street art.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

A kaleidoscopic warehouse-maze of handmade neon signs.