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

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

This massive swimming pool is the high tech home to the human-powered submarine races.

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.

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

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

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

The man who first patented the Ouija board rests in peace beneath a headstone that playfully reflects that achievement.

The site where Poe “in great distress, and ... in need of immediate assistance” likely died.

The trials and tribulations of marking Poe’s grave.

Final resting place of the author who wrote the ghost story "The Turn of the Screw," and his brother, the Harvard doctor and paranormal investigator.

One of America's most historic homes also holds a startling literary legacy.

The only surviving prototype for Buckminster Fuller's house of the future.

One of the few working locomotive roundhouses in the United States.

A sealed test tube said to hold Thomas Edison's dying breath was given to the inventor's friend and mentee, Henry Ford.

This recently restored timepiece has stood all around Kansas City.

What was meant to be a temporary exhibit is now a permanent fixture at the St. Louis Zoo filled with beautiful birds.

The fastest mail service in the west is tracked and memorialized along this 1,400 mile trail.

Less a museum than a bizarre fantasy world created by artists and engineers.

A smoke stack so large, the Washington Monument could fit inside!

The residents at this Yellowstone wildlife park will certify your cooler as "bear-proof."

The bullet-riddled wall from the St. Valentine's Day Massacre, bloodstains enhanced for your viewing pleasure.