A small pack of an ancient, hairless breed of dog once believed to guide souls through the underworld lives on its grounds.

A ghost village sits atop a mountain within Jordan’s largest biosphere reserve.

In Texas, a replica Irish castle is home to a charismatic pack of llamas.

Travel through the hidden underbelly of the city in colorful tunnels filled with art and history exhibits.

A collection of beautiful crystals shaped like freshly plucked roses.

A university observatory dome painted to resemble the beloved 'Star Wars' droid.

Twenty-year effort to raise a castle using tools and techniques from the 13th century is now abandoned in the Arkansas woods.

This ostentatious Italianate palace of an Oklahoma billionaire is filled with several themed mini-museums.

The future of roadside attractions is this sci-fi soda mecca that is home to a 66-foot tall neon pop bottle.

This unusually circular centenarian barn became a Route 66 icon.

Large-scale contemporary artworks tower over fields and lurk in forests around a Jacobean manor house.

Life-size figures portray depot attendants, train crew, and passengers frozen in time at the oldest railroad station in Arkansas.

Erotic art covers the walls of the largest ancient pleasure palace.

Is this the most Portland place ever?

Thousands of artifacts relating to human sexuality, including the world's largest sex bike.

Walls of stone rise up from sinkholes caused by underwater erosion.

An arresting arch punched straight through a mountain provides one of the most scenic spots, and challenging climbs, on the planet.

A darkly erotic open-air statuary in Catalonia.

This Canary island is a quintessential example of nature’s beauty, and its unbridled fury.

This abandoned, turn-of-the-century astronomy hub is now the subject of more photographs than it ever took.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

This mountaintop observatory is home to one of the world's largest reflective telescopes.

This "flat geyser" bubbles up out of the ground periodically like a disappearing river.

Spain's stunning solar energy plant.