A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

"A hideous albatross in the Hudson River Valley."

These sculptures were designed to beautify this neighborhood when it was established in the 1940s.

This old estate is a remnant of when the Bronx was a popular summer destination for wealthy New Yorkers.

A former connection to City Island, it has been abandoned since the 1930s.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

A waterway covered over after the Industrial Revolution has been unearthed and cleaned up, for the enjoyment of fish and humans alike.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

Named after an outlaw who used the basin as a hideout.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

The souvenir got the company’s founder out of a pretty pickle at the World’s Fair.

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

Remember and reflect at this 9/11 memorial site.

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

When oil was discovered just outside of Pittsburgh, the city became home to this regional stock market.

This cannon dating to 1755 has stood guard at this suburban intersection since 1915.

A bronze statue of Mister Rogers in the neighborhood where he grew up.

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

The site of the little-known Pennsylvania battle that sparked the Seven Years' War.

The penultimate and final resting places of British General Edward Braddock—minus a few bits and pieces.

Chase waterfalls, hiking trails and more.

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

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