These passages carved from the Antarctic ice hold strange shrines to the harsh southernmost climes.

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

The final resting place of the tragic king and queen of the Jazz Age is tucked away in a small Maryland graveyard.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

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

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

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

A small triangle of DC grass is the final resting place of one of Sonny and Cher's songs.

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

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

A super-sized promotional trick that is now a D.C. landmark.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

Home to items never before seen by the public.

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