This stone gatehouse was once the entrance to a historic mountain resort, and it had a cameo in a cheesy cult horror movie.

This abandoned factory on the Hudson River once churned out a million bricks a week.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

This high-perched pachyderm marks the memory of not one, but two elephants gunned down in small New England towns.

Protecting the future of some of the rarest and most misunderstood mammals of North America.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

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

The "lovely red Vega" of the legendary record-settling pilot.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

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

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

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

The land is home to swimming ponies and a legendary 18th-century treasure.

These old doors are covered in the signatures of Rehoboth Beach artists dating back to the 1930s.

WWII-era bunkers are hidden under the beaches of this picturesque park, which is still scattered with wartime watchtowers. .

The historic home still shows the scars from a little run-in with the British in 1813.

A wrecked ship dating back to the American Revolution was only recently discovered off the Delaware coast.

A statue of the English poet for whom this Delaware town is named is ritually dressed in seasonally appropriate clothing.

What began as an art installation is now the private drinkhaüs for a brewery's employees.

World War II bunker still standing on the New Jersey beach.

The Dover International Speedway is home to a towering, concrete-skinned, racecar-hungry behemoth.

A scenic fort on the harbor protected Philadelphia from an attack that never came.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.