This tiny structure was built by the creator of the Brooklyn Bridge.

A giant light 13 feet high shines near Thomas Edison's old Menlo Park lab.

Several times a year, during low tide, two pairs of historic train tracks are revealed on this New Jersey beach.

Affectionately known as "Lord Bot," this historic statue has a cult social media following and rightly claims to be “the most metal inhabitant of the Wren Yard.”

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

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

A drab two-story office space in Delaware is a hidden tax haven for Hillary Clinton, Donald Trump, and over half the Fortune 500 companies.

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

A field of nothing but boulders which resembles a giant's gravel driveway.

A diorama of the Civil War, fought by cats.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

This little-known Revolutionary War fort is supposedly haunted by the ghosts of its past.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

This might just be the TARDIS of bookstores.

This splendid Versailles-inspired mansion has the largest French-style formal gardens in North America.

A blend of art, antiquities, and Americana fill this museum, surrounded by whimsical, enchanting gardens.

Yo, Adrian!

Golden and naked, the figure that was once the highest point in New York is all that remains of the second Madison Square Garden.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.