A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

Time travel with sweets across history at this research-based candy store.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

A sculpture made of 10 Cadillacs as a monument to the “Golden Age” of the American automobile.

The last SR-71 ever constructed.

Inside houses a vast collection of military aircraft and missiles spanning the ages.

The world's tallest doric column is this Ohio monument to a naval victory in the War of 1812.

Marvel at this turn-of-the-century masterpiece that has been turned into a rather stately supermarket.

You can walk through the first Boeing Air Force One, which famously carried JFK's casket from Dallas back to D.C.

Cleveland's giant "free" stamp is a nod to the Civil War, but was misinterpreted for years.

A real flying saucer, contracted by the U.S. Air Force.

Deep scars on the earth left by the Ice Age.

This restaurant proudly displays bread signed by the 39th president.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

The 28,000-year-old specimen is remarkably intact.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.

An overlooked memorial honoring the local Washington residents who died in World War I.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

The only National Monument ever to go missing for nearly 50 years then resurface in a dump.

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

The institution is sitting on a goldmine of 21,000 paints, varnishes, pigments, and primers preserved for posterity.