A larger-than-life statue of America's favorite sundae marks the place it was invented.

This huge, disused viaduct is now a crumbling concrete underworld of covered in years of graffiti.

A local prank turned town icon.

The pop art icon's gravesite is broadcast 24 hours a day on his museum's website.

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

America's first serial killer rests in anonymity.

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

The oldest surviving botanic garden in the United States.

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

The universally beloved children's television figure is interred on a high hilltop in one of western Pennsylvania's oldest cemeteries.

This might just be the TARDIS of bookstores.

This Philly cemetery is the eternal home of many famous area residents, including Rocky Balboa's wife.

This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

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

A stone arch leads to a cavernous 1930s spring house tucked away in the Pennsylvania woods.

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

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

A layered tribute to the work of mosaicist Isaiah Zagar.

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

Whimsical cookie-themed plaques mark the birthplace of the Fig Newton.

The hero of the women's suffrage movement birth home is now a museum dedicated to her legacy.

The 1920s child prodigy author was last seen here at her Brookline home before vanishing at age 25.

Dedicated to one of the darkest moments in Irish history.