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

Home to items never before seen by the public.

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

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

A museum and tribute to a brave profession.

Decades before the scandal, this staircase on the river was a literal "water gate."

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

For 60 years, the academy had no permanent location until members voted Washington D.C. as its forever home.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

Seattle's own bad art museum located inside Cafe Racer.

The hundreds of movies and television shows shot in this high desert town are commemorated in a unique museum.

Towering basalt columns, a creation of fire and ice.

A charming desert roadside bakery that produces 10 times more bread daily than it has residents in its town.

This rock formation named for its unique shape is one of many that call the Alabama Hills home.

The tragedy of the Japanese internment camps is remembered here by a stark "Soul Consoling Tower."

Quite simply the largest tree in the world (by volume).

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

Oh, just a motel on the edge of the desert decorated with thousands of clowns conveniently located next to an abandoned graveyard.

This arts and culture cultural center explores the diverse cultural heritage of the American West.

The longest living non-clonal organisms on Earth.

James Turrell's total color immersion art installation, hidden on the top floor of a luxury handbag shop.

A living archive of urban activism and space reclaimed.