In which a local geological marvel becomes a quaint roadside attraction.

This semi-spooky remnant of an abandoned hotel provides fantastic views.

A recently abandoned psych ward at the end of Sanatorium Road.

Mysterious rocks that ring musically when struck.

This collection of odd proofs of concept is like taking a walk through the imagination of a Victorian engineer.

This might just be the TARDIS of bookstores.

A modern ghost town whose inhabitants were driven away by the growth of nuclear power.

Inside this 150-year-old barn turned antique shop is a vast array of items for curios hunters.

Pennsylvanian mass grave and possibly mass murder.

Delicate Wurlitzers, creepy clowns, and The Noid all share space in this insane explosion of kitsch history.

Surrounded by industrial sprawl, a small monument marks the site of William Penn's first landing in Pennsylvania.

A beloved horticultural oasis on the grounds of a wealthy family's former estate.

A glittering Thai Buddhist temple in suburban Pennsylvania.

One of the oldest log cabins in America is one of the last of its kind this historic Swedish dwelling remains a piece of living history.

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

The oldest surviving botanic garden in the United States.

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

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

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

One artist's love letter to his city and its citizens plays out across dozens of bright murals painted on the sides of decrepit buildings.

The world's third-largest crystal sphere has sat in the Penn Museum since 1927 with the exception of one outlandish theft.

This meticulously extracted nervous system allegedly came from a 19th-century custodian who donated her body to science.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

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