For decades, a bottle factory dumped their waste into these waters—now it's considered the best sea glass beach in England.

A deserted medieval village where bodies were once mutilated to prevent them rising from the dead.

Indents in the pavement are all that remain from a grisly death machine in Paris.

A trio of giant wooden megaphones turn up nature's volume in this Estonian forest.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

This painted marvel is San Francisco's 400-foot ode to urban biking.

This eatery transports diners to a place that no longer exists: East Germany.

Sitting atop San Francisco's tallest hill, a cross honors the victims of the Armenian genocide.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

This shop specializes in oddities and Victorian-inspired wonders.

This unassuming tree stump reportedly traces its roots to the famous pharaoh queen's reign.

One of the oldest libraries in England, and one of the last of the great medieval chained collections.

This silent sentry in the crypt below a large Gothic cathedral is often knee-deep in water.

Ask nicely, and stewards of a centuries-old charitable tradition will give you free bread and beer.

This gravestone and its inscription inspired a movement that has spanned generations and saved countless lives.

The body of an unidentified woman, visible through a glass coffin, was discovered by accident.

The ghosts of Britain's telecommunication past sit rusting away in a small village in England.

This amazing 15th-century mural remained hidden in plain sight for centuries.

It's believed Matilda Fitzwalter's life was the basis for the famed literary figure.

Virgil's many-mouthed gateway to the underworld.

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

Steaming blood-red hot spring from hell.

The world's toughest modern Christian pilgrimage leads directly to the gates of Hell.

A deadly ancient portal to the underworld.