Washington's iconic carousel has a nice piece of Civil Rights history.

The house where John Wilkes Booth conspired with his co-conspirators.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

Come for the pizza, stay for a performance on the world's largest theater pipe organ.

This small, unassuming street is now a canvas for color and creativity.

A geological mystery on Camelback Mountain.

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

In this small Phoenix taxidermy emporium, you can find everything from a squid in a jar to a freeze-dried toad.

The first permanent memorial to a unique secret weapon of World War II.

This striking public art installation is suspended above a public park, designed to gently move in the breeze.

A self-built castle made by a mysterious man.

A colorful, century-old cemetery of the Yaqui Indian Tribe hidden amid the suburban sprawl of Tempe, Arizona.

A mysterious "wedding cake" castle in the middle of the urban desert.

Last residence of H.P. Lovecraft featured in his story "The Haunter of the Dark."

This historic collection of Native Alaskan artifacts was resurrected through a partnership between the WPA and tribal artisans.

For almost 100 years, this site of peace and spirituality has existed on the California coast.

This densely-packed cluster of buildings was saved from the wrecking ball and turned into an art community.

Now housed in a museum, this giant pink elephant stood in downtown Seattle for more than 60 years.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

The Corinthian columns that towered over Abraham Lincoln’s inauguration stand proud.

A simple Colonial home with a past haunted by death and madness.

This sculpture forces visitors to confront their relationship with space.

A model of a galactic embassy is hidden in plain sight along the highway, proposed by a UFO religion to find the aliens that created life on Earth.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.