One of Frank Lloyd Wright's greatest—and favorite—architectural masterpieces was almost lost.

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

Before founding the American Red Cross, Clara Barton had a tremendous humanitarian impact by locating thousands of missing soldiers.

This massive monument honors the first human in space.

This 3,500 pound obelisk was constructed with more than 1,000 reclaimed guns.

Ironically this massive termite is the mascot for a company that is acclaimed for killing his kind.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

To avoid the demolition costs this abandoned drawbridge was simply left in the up position.

Eclectic collections, artwork, and some feline friends fill the writer's former home.

Dubbed the "Blade Runner dragon," this buzzing neon sign is a beloved local icon.

A monument to the egos of two railroad magnates that fell into decline along with their careers.

The world's only three-story rotary jail is now a museum to a bizarre trend in prison design.

Pillars made of 700 pieces of luggage climb to the ceiling of Sacramento Airport's baggage claim.

The capitol city's oldest existing cemetery.

I Street Bridge is the heaviest swinging center bridge in the United States.

This 15-story mural celebrates the 50th anniversary of the musician's iconic "At Folsom Prison" album.

One of the largest artillery pieces in the world sits in a Washington D.C. parking lot.

This massive railroad spike celebrates the 1939 premiere of the movie “Union Pacific.”

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

These 18th-century paintings of Warsaw were used to reconstruct the city after World War II.

The sumptuous ceiling was one of the last things Charles I saw before his execution.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

An antique narrow gauge railway line still running through the Colorado and New Mexico mountains.

Homemade rockets, dinosaurs, and robots make this New York small business much more than a furniture store.