Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

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

This historic national park is covered in the stunning ruins of red rock pueblos.

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

Most-visited and most-photographed slot canyon in the American Southwest.

Dramatic river bend surrounds a natural red-rocked pedestal.

This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

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

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

This iron and wood Civil War city-ship was the first vessel to be sunk by an electrically detonated torpedo.

A sharply wedged sundial marks the point at which each day in the United States begins.

This huge pile of volcanic boulders hides a stunning network of secret grottoes.

A perfect circle of twenty-four mysterious holes dates back to prehistoric time.

Near the ruins of a Civil War coastal fortress lies the only known African refugee cemetery in the United States.

Japanese gardens dedicated to the Japanese farmer that refused to throw in the trowel.

Former villa and estate of James Deering developed to preserve native tropical forests.

In the depths of the Everglades, one man has dedicated his life to studying the elusive Skunk Ape.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

The museum chronicling a treasure hunter's dream, fulfilled.

"We Seceded Where Others Failed."

An idyllic swimming pool tells the tale of Hemingway's trouble with women.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

A historic presidential getaway on the continental United States' southernmost island.