"Not too many people can say they've had a nuclear bomb dropped on them, not too many would want to." — Walter Gregg.

The sole remaining outpost of a once-thriving South Carolina chain still sells “pic-a-nic” baskets.

This airfield is home to a number of retired vintage planes in various states of disrepair.

A former Oz-themed attraction that has fallen into disrepair, but still holds some of the original magic.

A 120-year-old legend concerning an empty circular patch in the North Carolina woods.

Granite outcropping that the state's tourism bureau doesn't promote because of its delicate ecosystem.

An abandoned village that doubled as "The Hunger Games"' post-apocalyptic wasteland is up for grabs.

Once part of an ancient international harbor, it's now an all-you-can-eat shrimp buffet for flamingos and other water birds.

Rare recess caves fill this unbelievably beautiful Ohio park.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

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

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

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

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

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

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

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

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

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

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

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

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