Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.

More than five miles of underground passageways.

The record holder for the world’s largest peach.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

This shifting North Carolina sand dune is an odd little desert surrounded by oceanic forest life.

The Pentagon sits on a former island that was in Virginia at low tide and D.C. at high tide.

The controversial urban planner who designed Washington, D.C., was buried in Maryland, and can presently be found in Virginia.

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

Located at the former Lorton Prison the Lucy Burns Museum tells the story of the 91 year history of the prison including the dark chapter of its involvement in the women's suffrage movement.

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

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

The romance of early commercial flight still fills this Art Deco destination.

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.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

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

The rogue roots are gradually consuming some of the historic marble grave markers.

This unique historical monument features large concrete spheres designed to resemble fallen stars.

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

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

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

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.

A line of blue paint marks the route of the inaugural parade.