A natural history wunderkammer in the middle of the desert.

The world's largest military aircraft cemetery.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Decades before the scandal, this staircase on the river was a literal "water gate."

Home to items never before seen by the public.

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

The house where John Wilkes Booth conspired with his co-conspirators.

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

FDR's Art Deco hospital tower was hopelessly inefficient.

A hidden passageway now marks the site of an assassination attempt on Ronald Reagan that some say broke a 140-year-old curse.

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

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

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

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.

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

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

These unusual rooms on wheels are holdovers from the 1960s.

A mammoth pair of Civil War artillery guns abandoned out in the forest.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

An oddly poignant roadside attraction celebrating American folklore.

A dictator's failed public works project has been reborn as two linked trails through spectacular scenery.

The United States Capitol's former columns still stand.