It took more than 20 years and a sharp eye for one man to assemble this quirky collection.

A galaxy of glowworms—larvae of a gnat—hides deep in the belly of these caves.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

"You can only scalp a customer once, but you can give him a haircut every two weeks"-Barber's Maxim.

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

The last remnants of Fort Pitt also hold the distinction of being the oldest structure west of the Allegheny Mountains.

A grandiose title could not save this mercantile community from obscurity.

Landmark dedicated to the plight of the American Indian in the 21st century.

Faces carved into the cliffs create an otherworldly walking trail.

Take a drunken tour inside the world's largest known geode.

The tragic reality of a town riddled with rumors of haunts, chemical spills, and serial killers.

An elegant sandstone stairway built by the WPA still connects two neighborhoods in Akron.

This campus museum commemorates a national tragedy.

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

This massive airship factory is so large that it has its own indoor weather.