The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

Elevated freight railway turned wildly successful urban park.

Medicinal spa created with the discharge from a geothermal energy plant.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

The fairy tale castle of the "fairy-tale king."

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

The world's only museum devoted to the wonders of fluorescence.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

World's largest collection of serial killer artwork and other macabre exhibits.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

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

A cheeky architectural easter egg.

A small canyon with petroglyphs and a seasonal waterfall, only a short hike from the remnants of old Route 66.

This old selenite mine is dotted with tiny crystals that make it shimmer like it's covered in glitter.

A Wild West jailhouse that slid down the mountainside.

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

Witnessing the might of this dessert-colored desert waterfall is a rare, powerful treat.