One of the steepest streets in the United States makes an intriguing challenge for cyclists.

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

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

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

Over 100 concrete munitions bunkers are all that remain of a Pennsylvanian village seized by the US government.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

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

This permanent exhibition celebrates the finest of our heartless automatons both real and fictional.

Buildings that dynamite couldn't bring down were abandoned because of bathroom issues.

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

This little museum in the town where zombies were born celebrates the living dead.

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

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

Mutant vegetables, transgenic mosquitos, and atomic rodents span the walls of this one-of-a-kind museum.

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

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

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

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

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

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

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

A take-out restaurant that only serves cuisine from countries with which the United States is in conflict.

A rare view of a preserved Victorian science museum.

Mysterious rocks that ring musically when struck.