Life-sized sculpture of a blue whale made of hand-recycled plastic trash.

A natural formation that resembles a camel resting in the New Mexico desert.

This museum started as a collection of Manhattan Projects and continues to add exhibits as they are declassified.

Seller of surplus nuclear research materials.

Once a dining hall for boarding school students, this lodge was a popular haunt for nuclear physicists working on the Manhattan Project.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

Giant origami sculptures tucked into desert scenery beckon passers-by to explore further.

This sparsely populated town offers a look back in time.

The 7,000-year-old calcium carbonate formation creates a magnificent natural bridge.

A museum devoted entirely to the rattlesnakes and snake-related art.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

The colorful stairs are made with marble from the world's major quarries.

A 200-year-old collection of oddities and medical paraphernalia.

These ruins witnessed the final gathering of the failed Jacobite Rebellion.

A castle in the Scottish Highlands has been continuously inhabited since the 1300s.

The taxidermy remains of the first mammal ever cloned from an adult cell are on display in Edinburgh.

A glacial pothole was once a hideout for a notorious Scottish outlaw.

Largest lake in Great Britain measured by surface area.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.