This dramatic rail curve was once the target of a failed Nazi attack.

Memorializing an American tragedy of massive proportions.

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

Dozens upon dozens of boulders engraved with scripture tell the story of one man's troubled life.

For decades, it has disappeared and reappeared as water levels rise and fall.

Hidden in the hills of Western Pennsylvania lies one of the best-kept ghost towns in America that you can legally visit.

The oldest continually operating golf course in the United States.

An abandoned railroad tunnel transformed into a creepy path for hikers and cyclists.

Could it have picked a better place to land?

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

"Where the ducks walk on fish."

The Pennsylvania landscape depicted by a quarter mile of mosaics made from used road signs.

The site of America's first commercial oil well essentially disappeared after the town went bust.

Where the oil industry began.

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