The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

Twice a day one of these tragic bronze mariners drowns with the tide to remember all those the sea has taken.

The famous facade of Grand Central Terminal hides a regulation tennis court—and it's not the first one.

This once-grand marvel of engineering is now 41 miles of scenic hiking trail.

This famous bridge twisted itself into oblivion, but not for the reason you might think.

Iconic rock formations that allow for exploration during high or low tide.

The first bridge observation tower in the U.S. offers one of the best views of Maine.

These powerful, if squat, Canadian waterfalls flow in different directions depending on the time of day.

A former poultry store that looks like a giant duck and is one of the "seven wonders" of Long Island.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

The highest point in Connecticut was incorrectly memorialized before surveyors discovered the actual spot.

This roadside dinosaur park offered up lumpy neon thunder lizards in the name of kitsch and education.

Georgia's highest point was given its strange name thanks to a simple translation error.

The highest point in South Carolina was once owned by an energy company that neglected it but now the state is taking it back.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

This was one of the first (and last) university-built and operated nuclear reactors.

The oldest living organism in New York City. Maybe.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

A fountain standing as a testament to a doomed alliance.

A grand New York post office that is home to mailman Santas, scraps of postal history, and a pneumatic mail system.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

Reclaimed by nature, the ruins of Doodletown, New York are remnants of a town consumed by a state park.

Mysterious stone tower featured in many alternative histories of the New World.