A 500-year-old series of tunnels long believed to be folkloric was uncovered beneath the streets of Puebla.

The ruins of an ancient city built by Mayan traders is centered around a temple of a sacred feathered serpent deity.

An indigenous take on European design creates a stunning visual overload.

This staircase full of Mayan hieroglyphics is perhaps the largest single text in the world.

A full-size replica of this well-preserved temple lets you take a walk through the Mayan age.

The last four extravagant street signs of London's historic banking street.

The wooden telephone box hidden away in London's Piccadilly was the original prototype of the iconic kiosk.

An artistic tribute to the famous singer, just around the corner from where he was born.

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

This London plaque marks the spot where David Bowie's famous alien made his debut.

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

Dictionary Johnson’s favorite feline.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

Hidden behind a wall for decades, this masonic lodge was only rediscovered during renovations.

Scattered throughout London are ancient remnants of the city's former bounding wall.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

Rebuilt remains of a temple to Roman god Mithras.

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 largest of London's subterranean rivers and once a mad, bad center of London life.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

The oldest and smallest cemetery in Paris is only open to the public twice a year.