Monasteries on rock pillars, once accessible only by frayed ropes.

This fortress dates back to the 6th century and is also the site of a controversial abandoned restoration project.

If it hadn't been caught in time, a flaw in the design of this Manhattan skyscraper could have led to its collapse.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

This abandoned airplane hanger is said to have once been a top secret launch facility.

This natural Icelandic fissure allows divers to swim right between two volatile tectonic plates.

A perfectly preserved hill village where the buildings are painted like white lace.

A pocket of jungle amidst urban expansion in Panama.

A giant Troll lurks under one of Seattle's oldest bridges.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

One of the world’s most colorful cemeteries, where each pigment is symbolic.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

A 100-year-old purveyor of curiosities, curios, and kitsch featuring mummies, shrunken heads, and a Fiji Mermaid.

This edible park is open to any and all foragers.

This former coal gasification plant found a curious second life as a popular public park.

This 19th century granite fortification is one of the most well preserved forts in New England.

These ruins of a pre-Columbian cliff village are among the most beautiful and well preserved in New Mexico.

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

This abandoned horse racing track was an exercise in hubris from its inception.

The unusual burial monument of Arizona's first governor.

This 40-room dwelling tucked within a cliff was built by the basin's prehistoric residents.

Hike the unusual hoodoos and rock formations that form this little-known natural wonder.

A living snapshot of a different time in America is preserved and maintained by a community of volunteers.