Exact replica of the ancient monument, but much, much lighter.

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

This brick-lined pedestrian walkway was once a railway tunnel used during the Civil War.

The first national memorial to honor all women suffragists stands on land where suffragists were once imprisoned.

The last of nine massive kilns that produced many of the red bricks for buildings in Washington, D.C. and northern Virginia in the early 20th century.

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

In an odd geographic anomaly this city borders two different states on opposite sides of town.

This free, take-a-book shop seems like a trick but isn't.

It was once the base for a series of domestic terror attacks.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

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

Built to defend Washington D.C. during the Civil War, this fort became a post-war nucleus for a thriving Black community.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

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

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

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

America's first federal monument.