A former plant in one of the hubs of U.S. steelmaking has been turned into this museum celebrating the history of American industry.

The crumbling remnants of this 19th-century quarantine hospital hint at the touristy island's darker past.

A 19th century hat factory still stands as a crumbling ruin in upstate New York.

This winding road of 318 curves is a must-visit for (careful) motorcycle and sports car enthusiasts.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

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

A former poultry store that looks like a giant duck and is one of the "seven wonders" of Long Island.

An eccentric playboy's astounding natural history collection.

A millionaire's abandoned swimming pool from the gilded age of one of America's most distinguished families.