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

The headquarters of the Fraternitas Rosae Crucis, complete with Rosicrucian pyramids, all in the Pennsylvania woods.

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 weeping, 10-foot-tall sculpture was a maquette for a 9/11 memorial.

The home and studio of a visionary woodworker now stands as a museum and example of his artistic genius.

This giant disembodied horse head seems to balance impossibly on its nose.

A glittering Thai Buddhist temple in suburban Pennsylvania.

Erected in 1697 this Philadelphia bridge is the oldest surviving roadway bridge and perhaps the oldest stone bridge in the United States.

A completely round house designed for the Atomic Age.

Frank Lloyd Wright built this suburban synagogue late in life, but it stands among his most iconic masterpieces.

North America's oldest quarantine facility was built in response to Philadelphia's 1793 yellow fever outbreak.

America's first serial killer rests in anonymity.

Contrary to popular belief, this secluded statue doesn't represent Pennsylvania's founder.

Where America's first doomsday cult awaited the end of the world.

An Irish Memorial commemorating those who perished due to potato blight.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

Century-old shop, specializing in Occult products.

A daily replay of the experiment that proved the rotation of the Earth.

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

Incredible sculptures inspired by obscure passages from the Bible.

This haunting tombstone comes complete with a heartbreaking story of love and loss.