These disused steel furnaces are now haunting ruins that may one day be a national park.

This abandoned dream castle and its cemetery look out over the city that once inspired their creation.

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

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

Color-coded signs direct drivers on a network of routes designed to avoid Pittsburgh traffic.

This secluded walking trail is a hidden gem of a Pittsburgh park.

This picturesque stream was up until recently the site of a ten story mountain of slag and sewage.

Pittsburgh's literal underground railroad.

This public park was the site of the largest civilian disaster of the Civil War.

Meet your friends, marry your true love, or tell your enemies to kiss your butt under this historic Pittsburgh timepiece.

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

There aren't too many operational funiculars around, but Pittsburgh has two!

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

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

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

Found art has transformed this Pittsburgh neighborhood into a psychedelic dream.

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

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

House of vintage taxidermy and Steampunk sculptures in a quiet Pittsburgh neighborhood.

A hands-on traveling collection of the innovative devices of yesteryear.

This interactive gallery makes you feel like you've stepped into a fantasy world filled with whimsical monsters.

Once America's longest-manned military fort, now an abandoned hulk.

A mysterious, abandoned building rotting on the Brooklyn waterfront.

The most unloved grain elevator in Brooklyn was a “Magnificent Mistake.”