Pennsylvanian mass grave and possibly mass murder.

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

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

This restaurant offers a side of antiques, curios, and a bathroom chock full of owls.

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

A historic covered bridge is but one example of an oddly prevalent American urban legend.

America's first serial killer rests in anonymity.

The ruined remains of a coal mining ghost town are hidden within the woods.

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

This park contains a number of standing stones meant to heal and inspire.

A macabre farm reserved part of its 222-acres for dead bodies, all in the name of science.

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.

The first American department store, and home to the largest operating musical instrument in the world.

In the early 1800s, surgery was also a show.

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

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

The abandoned coal loading dock is a canvas for unsanctioned art.

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

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

This church in Pittsburgh is home to the largest collection of religious relics in North America.

This Old Testament garden features 100 plants from biblical times.

The graffitied ruins stand hidden within the Pennsylvania woods.

A train station that was abandoned by the coal industry and was later converted into a cocktail bar.