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

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.

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

Contrary to what one might expect, ice forms inside this small cavern during the summer and melts during the winter.

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

Enjoy a slice while browsing the world's largest collection of pizza memorabilia.

An outlandish shoe shaped house built by an eccentric millionaire.

This Pennsylvania cave holds evidence of the oldest known inhabitants of North America.

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

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

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

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

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.

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

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

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

Mysterious rocks that ring musically when struck.