The floor of the oldest surviving synagogue in the Americas is entirely covered in sand.

Crumbling ruins mark the site of a couple's grisly murder in the woods.

A medieval bridge stretches over a sulfur-rich river that leads to year-round natural hot springs.

A micro-communist utopia in Spain with no police, no mortgages and full employment.

A contemporary fresco movement illustrates the region's rich history.

The Brutalist building harbors an unusual inverted dome that swoops down over its central sacred room.

Locals visit this abandoned train tunnel where a man took his own life to ask favors of his spirit.

The bombed out remains of the old church were kept intact next to the new one, as a reminder of the futility of war.

This steep cable railway has been hoisting passengers in the heart of Québec City for over a century.

An abandoned brutalist monument whose history has been lost to the ages.

A boat ride through utter darkness, lit only by headlamps, reveals an emerald green pool locals believe is sacred.

An abandoned 1920s-era stretch of cabins now overshadowed by the 66 Motel.

An abandoned Ecuadorian prison that once held ex-presidents and notorious con artists is now a carceral museum.

This unique sanctuary invites you to interact with the beautiful birds.

The school produces some of Africa's most talented acrobats and contortionists.

A luxuriant botanical garden below sea level.

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

The 1,000-year-old abbey is the birthplace of modern musical notation.

London's only public statue of the much-married monarch adorns the gate to St Bartholomew’s Hospital.

100 year tradition of fist fights, marked by marble footsteps.

A French valley with forests so lush it was nicknamed "the Small Amazonia of the Pyrenees."

Six times a day a train runs right through the middle of this Thai street market, sending vendors scrambling.

The world’s largest digital waste dump has become a site where organized criminals hack into confidential government data.

Washington's top-secret Cold War-era doomsday communications tower is located in a small neighborhood park.