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

Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.

A faded sign from the 1920s remembers Baltimore's resistance toward banning alcohol.

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

A cave on the Maryland border where civilians took refuge during the bloodiest battle of the Civil War.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

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

The remnants of a wooden-hulled fleet built and abandoned in WWI, now home to a thriving ecosystem.

This English-inspired Maryland garden is home to acres of opulent plant life including bushes shaped into an entire fox hunt.

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

A hidden alley in urban Baltimore is a haven for graffiti artists.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

The first marker along the famous boundary.

This strange, big-tailed beast became a Pennsylvania town's unofficial mascot.

These lush botanical gardens employ the most purrfect pest control force.

An outlandish shoe shaped house built by an eccentric millionaire.

The house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.

A mine fire has been burning under the deserted town since 1962, but this church is still going strong.

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.

The origin of this mechanical boy was a mystery until he revealed his maker by writing it in perfect cursive.

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

Frank Lloyd Wright’s most iconic home dangles over a Pennsylvania waterfall.

A toxic ghost town sitting atop a massive coal fire.