Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

The most accurate timepiece in the world.

A painfully obvious spy house sits right across the street from the Russian Embassy.

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

Disks are rolled out onto the south lawn to absorb the impact of Marine One's wheels like giant coffee coasters.

This dig site outside D.C. is known for its exceptionally high density of baby dinosaur fossils and dinosaur eggs.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

This museum honors the first Spanish land grant in California which is still in the hands of the original owner's family.

This seemingly random 30-foot statue of an oryx in Qatar's capital was a mascot for the 2006 Asian Games.

The final resting place of American icon Buffalo Bill, and a museum that aids in telling his tale.

Yo, Adrian!

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

Huge masonic hall in Philadelphia with lavishly themed rooms.

An Irish Memorial commemorating those who perished due to potato blight.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

This elaborate towering structure was once famed for its revolutionary height.

A pair of 7-foot legs belonging to the military man of the Mayflower stand jauntily by the side of the road.

The only parking meter in the entire town, it is surrounded by 100 free spaces.

If you dial the number in this abandoned office window "Sam Spade’s" secretary will ask you to leave a message.

This "life-size" depiction of Mickey Mouse as a half-lobster is both whimsical and a bit creepy, standing guard over the Boston waterfront.

Once a mortuary that held the remains of Buffalo Bill, this Denver hotspot is now a death-fixated restaurant.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.