Rimmed by white crusts of salt on every edge, Lac Assal is one of the saltiest bodies of water in the world.

Elaborate patterns adorn the city's disappearing traditional architecture.

This ancient tunnel is one of the most important examples of Roman hydraulic engineering in Spain.

This mysterious hilltop collection of Druid carvings isn't quite what it seems.

This palatial, 99-doored Colonial mansion is a marvel of architectural fusion.

The remains of the observatory of the Danish astronomer who first measured the speed of light.

This influential Renaissance-era library was once the haunt of kings and monks.

The largest known open fault in the United States is basically a giant natural refrigerator.

This otherworldly church spire reaches up toward the heavens.

The 10-foot-wide Long Beach home was built on a dare.

One of America’s oldest and spookiest hotels, thanks to the residency of ghosts, dead presidents, and Alfred Hitchcock.

This Wild West attraction is probably more fiction than history, but that doesn't mean it's not awesome.

A tiny replica of the iconic London landmark hides on the side of the steel structure.

While most bridges allow roads to pass over water, this one allows water to pass over a road.

This 14th century castle withstood years of battle but is now sliding off the hills into the Danube.

An ongoing medieval tradition of communal pig husbandry is honored with a handsome granite sculpture.

Exquisite carvings of leaves, Green Men, and the occasional dragon adorn a medieval chapter house.

Rainbow-hued in the summer and crystalline in the winter, this salty lake has inspired battles, temples, and plenty of awe.

Elevated freight railway turned wildly successful urban park.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

The largest lake in the Faroe Islands seems to be held hundreds of feet above sea level thanks to an optical illusion.

This art shopping center still boasts pieces of its past as a textile factory.

City Council meetings still happen in this historic building, impeccably preserved on the inside.

Traditional 15th century Chinese garden in the middle of Vancouver.