Once considered a marvel of engineering, this 107-mile canal played an integral role in building New York City.

On the Hudson resides one of the largest clocks in the world.

There must be a pun in this haystack somewhere...

Where manatees are the snowbird vacationers in these balmy Florida springs.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

One of the oldest, tallest, and most haunted lighthouses in America.

In the Shawnee National Forest, amazing rock formations peer through the treeline.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

Decades before the scandal, this staircase on the river was a literal "water gate."

An overlooked memorial honoring the local Washington residents who died in World War I.

The highest point in Maryland is only accessible by hiking through another state.

The penultimate and final resting places of British General Edward Braddock—minus a few bits and pieces.

This giant, rotating globe was built to celebrate the expansion of a company that makes steam cleaners and pressure washers.

This former fire tower found new life as a communications hub complete with a scenic overlook.

This one-room cabin where the young colonel slept during the French and Indian War.

Pennsylvania's highest point is spotted with boulders which were pushed to the surface by nothing but cold.

The first blast furnace in the United States that used coal and coke fuel instead of charcoal to make pig iron.

Maryland's first (and last standing) toll house on America's first federal road established the state as the "Gateway to the West."

This beautiful stone arch bridge wasn't even expected to stand for one day, but people have been crossing it for centuries.

A fictional town that was briefly brought to life before fading once again out of existence.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

An abandoned stretch of highway, deteriorating next to the operational one.

Beyond the usual stories that attend old prisons, this one has deep bloody undercurrents.