A self-built castle made by a mysterious man.

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

This expansive bridge in the Canadian wilderness was originally just built for friends.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

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

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

This scenic Maryland park was the site of one of the worst prison camps of the Civil War.

A Civil War Museum with some notable medical antiques.

Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.

Walk a trail through a historic Quaker town that outlawed slavery in 1777 and was a major waypoint on the Underground Railroad.

After hundreds of years of settlement, this once-bustling fishing village sunk into the Chesapeake Bay.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

This English-inspired Maryland garden is home to acres of opulent plant life including bushes shaped into an entire fox hunt.

A local farm's collection of unusual structures from a now defunct storybook amusement park.

The land is home to swimming ponies and a legendary 18th-century treasure.

Bizarre Cavern.

The unusual burial monument of Arizona's first governor.

This collection of Wild West movie memorabilia also claims to hold some secrets of the Lost Dutchman's mine.

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

A spiritual vortex among the red rocks in Sedona.

The massive, incredibly rare instrument is over 11 feet tall with a range so deep it goes lower than humans can hear.