An enormous warehouse filled with parade floats collected from over 50 years of patriotic celebrations.

Herbert Hoover's "Brown House" rural presidential retreat was a PR disaster amid the start of the Great Depression.

This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.

A museum dedicated exclusively to aircraft used in the military.

The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

The nearly 120-year-old piece of pork wears a brass collar and was once a man's "pet ham."

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

Hidden for 165 years inside a building designed by Thomas Jefferson are the remains of what may be America's first educational chemistry lab.

A double agent hid information for the Soviet Union beneath this bridge for more than 20 years.

This sprawling museum holds one man's giant collection of real tanks.

Hop on the train and tour an elaborate miniature town made completely of junk (including the train).

A bunker "with enough U.S. currency to replenish the cash supply east of the Mississippi" in the event of nuclear war now protects nitrate film.

An eight-sided home built during a brief octagon craze in the 1850s.

A convincing little bit of ancient Egypt smack dab in Richmond, Virginia.

This Virginia town has been famous for its fried chicken since the 19th century.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

Collecting 700 years of mechanical death-dealing, the NRA's sprawling gun museum is a revealing testament to the American obsession with armament.

This old-fashioned carhop restaurant gave the world the waffle cone.

The Virginia farm where John Wilkes Booth met his grisly end is now largely forgotten.

An extensive, if one-sided, history of U.S. law enforcement's war on drugs.

This war hero's old shop remembers the fine line between medicine and quackery during the Revolutionary War.

The home of pigs, snakes, chameleons, and the alleged largest bunny in the United States.

A "hospital" where people went to be quarantined, die, and be buried in the yard.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.