Locals call this magical moss-covered walkway the "Emerald Path."

An 18th-century Catholic church converted into an eccentric temple of music and bacchanalia.

Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

It would take 35 firetrucks to fill this enormous glacial pothole.

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

This titanic java kettle is one of the many kitschy landmarks located along America's OTHER famous highway.

This public space is speckled with the eerie remnants of a defunct amusement park.

The Pennsylvania landscape depicted by a quarter mile of mosaics made from used road signs.

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

A quiet, gothic haven nestled between Pittsburgh's Squirrel Hill and Point Breeze neighborhoods.

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

When the Austin Dam failed it destroyed much of Austin...and then it failed again.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

This hidden gem of a garden has one of the only surviving Victorian ferneries in America.

A museum dedicated to the strange and extravagant costumes and memorabilia of the mummers, a tradition older than Philadelphia itself.

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

A failed piece of Orientalism has become the proud symbol of a community.

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

The graffitied ruins stand hidden within the Pennsylvania woods.

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

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

Dr Barnes' $25 billion private collection of art and arboretum.

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

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