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.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

A toxic ghost town sitting atop a massive coal fire.

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

This elaborate towering structure was once famed for its revolutionary height.

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

A historic covered bridge is but one example of an oddly prevalent American urban legend.

A field of nothing but boulders which resembles a giant's gravel driveway.

This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

A tradition unlike any other, this marks the site of the annual Groundhog's Day tradition.

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

Board a mine car and descend the #190 slope 300 feet underground into the Clark Vein of coal.

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

Collection of trolley cars in the woods represent one man's attempt to preserve transportation history.

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

Mysterious rocks that ring musically when struck.

World's first "penitentiary," meant to be humane, drove men insane.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

A farm in New Jersey grew a most unusual crop for AT&T's testing purposes.

A historic grist mill and active sluice on the Black River.

The only remaining piece of hull of the most decorated US ship of WWII is this giant name plate.

The rusting remains are visible sticking out of the waters of the Delaware Bay.