What looks like a simple quaint estate in rural Pennsylvania was in the 18th century home to a small monastic community.

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

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

The oldest farmer's market in America is so ancient it was approved by the King of England.

The home of possibly the least-loved U.S. president stands as a sort of unpopular Monticello.

Historic home of America's sweetheart sharpshooter, Annie Oakley.

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

A pyramid commemorates the birthplace of James Buchanan, the 15th president of the United States

The Virginia farm where John Wilkes Booth met his grisly end is now largely forgotten.

The Home and murder site of the witch of Rehmeyers Hollow.

The resting place of a Civil War celebrity's amputated limb.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

This recreation of a 19th-century dime museum is full of oddities.

A diorama of the Civil War, fought by cats.

This advertisement for talcum powder was painted on the rock face and has since defied removal.

A pre-Industrial Age iron furnace and the site of a nearly-forgotten piece of Black history.

The largest cemetery for enslaved people in Loudoun County was almost lost to history, if not for the research of a minister.

The ruins of this long-abandoned unsuccessful gold mine can still be found.

The narrowest house in America is seven feet of pure spite.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

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.

There’s a hidden military meme engraved on the World War II Memorial.

This statue of one of baseball’s greatest pitchers looks like something out of a sci-fi horror movie.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.