The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

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

An indoor miniature village and labor of love for Laurence Geiringer, a model railroad enthusiast.

Oldest building in California still in use.

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

Yo, Adrian!

Phil Mortillaro uses keys to bring art back to the Village.

A bit of retro transportation flair preserved in the world's largest department store.

The rough and tumble president's childhood home displays the shirt he was once shot in and the speech that saved him.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

Visit the monolithic tomb of America's most famous general.

Mysterious 500-year-old tapestries depict a unicorn hunt.

The romance of early commercial flight still fills this Art Deco destination.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

At 207 feet, one of the world's longest continuous escalators.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

A diorama of the Civil War, fought by cats.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

This pun was simply waiting to come to life, and one defense contractor made it so.

A Civil War Museum with some notable medical antiques.

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

An overlooked oasis of quiet on the grounds of Washington's monumental basilica.