Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

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

A museum dedicated to the alleged Roswell Incident.

Elvis's own personal tropical hideaway.

A 19th-century Gothic, castle-like statehouse by the Mississippi River.

The LSU mascot lived on the college campus in one of the most impressive tiger habitats in the country.

A Circus legend leaves an unexpected endowment.

The time thousands of bags of chips washed ashore in the Outer Banks is memorialized in a local museum.

This shifting North Carolina sand dune is an odd little desert surrounded by oceanic forest life.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Rebuilt remains of a temple to Roman god Mithras.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

Famously misunderstood wonder of the ancient world

The oldest cemetery in New Orleans, resting peacefully for over 200 years now.

In 2010, Nicolas Cage purchased two plots in this cemetery using one to construct this strange pyramid mausoleum.

North America's largest accredited model railroad museum.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

San Diego's most historic and haunted home.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

This water tower slanted at an uncomfortable angle off the old Route 66 was an ingenious marketing ploy.