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

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

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

The narrowest house in America is seven feet of pure spite.

An original apothecary from 1792.

A superbly preserved example of Georgian residential architecture that was once home to one of the founders of Alexandria, Virginia.

Dedicated to the deadliest aviation accidents on Canadian soil.

Where a young athlete began his run across Canada after losing his right leg to cancer.

The first transatlantic wireless signal was received at this 17th-century fort.

A World War II gun battery sits at the easternmost point of North America.

"The Most Boring Road in the State."

This lone tree and dramatic sandstone outcropping are so beloved by Michiganders they can be found on one of the state’s coins.

An old drug store full of mortars and pestles, pill-making machines, and medicines reputed to cure most any illness.

This quirky museum celebrates the history of a local cod fishing industry.

This forgotten boat elevator was an engineering marvel in its heyday.

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

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

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

There’s a hidden military meme engraved on the World War II Memorial.

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

One of the most influential presidents in U.S. history wanted only this plain, elegant monument as his lasting memorial.

This sandwich shop has a century-old elevator behind a sheet of plexiglass.

A much-maligned monument to teetotalism.

The tunnel under the Capitol Building where Congress takes out its trash.