The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

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.

This cannon dating to 1755 has stood guard at this suburban intersection since 1915.

The Pentagon is so large that it was planned like a city, complete with internal highway infrastructure.

Rumor has it the hot dog stand was targeted by two Russian nuclear missiles.

A former major munitions plant that has been converted into a sprawling art space.

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

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

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

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

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

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

The resting place of a Civil War celebrity's amputated limb.

An original apothecary from 1792.

This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

This once-palatial plantation may have been the site where a draft of the Declaration of Independence was written.