This building holds the embalmed remains of the leader of the Bolshevik Revolution.

The Nazis lost more men trying to take this Russian-held Stalingrad apartment block than they did when taking Paris.

A star fort along the C&O Canal in western Maryland that protected America in three wars.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.

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

Home of the physician who set the leg of John Wilkes Booth after the Lincoln assassination.

The world's oldest continuously operating airport was founded by the Wright Brothers.

A lawn full of retired spacecraft on display at one of NASA's first research labs.

An FDR-era tuberculosis sanatorium has stood abandoned in the suburbs of the U.S. capital for over 30 years.

The development and impact of electronic media showcased in a picturesque farmhouse in Maryland.

A priceless collection of the Nation's cryptologic history.

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.

Part of a WWII submarine is lurking outside the Washington Navy Yard parking lot.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

One of the largest artillery pieces in the world sits in a Washington D.C. parking lot.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

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

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

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

A celebrity from the late Cretaceous period.

The national park was once a plantation estate.

The oldest continuously operating fish market in the United States.

An obscure public service from the U.S. government that redeems burnt, moldy, and soiled old greenbacks.