Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

One of Frank Lloyd Wright's greatest—and favorite—architectural masterpieces was almost lost.

The site of William McKinley's tragic assassination is only marked by an underwhelming boulder.

A beautifully designed asylum was resurrected as a hotel and art center with a ghost story or two.

The seat of Buffalo government is a gorgeous Art Deco palace.

A 19th-century architectural wonder designed by the "father of the skyscraper."

Buffalo's abandoned concrete grain elevators are getting a second life.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

A portion of the old Pirates stadium over which a defining home run once flew still stands even after the rest of the stadium was torn down.

Memorializing an American tragedy of massive proportions.

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

Bubbling up from deep underground is the warm crystal clear water that fills the Warm Springs Pools, America's oldest spa.

Cold War intelligence agents monitored communist embassies from an attic in a former pigeon coop.

Puerto Rico's once thriving oil company is now an abandoned wonderland of rusty steel.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

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

This small fort played a huge role defending Puerto Rico’s capital city.

This extraordinary Depression-era expenditure was modeled after a postcard of a Mediterranean hotel.

A pride of the state, this working museum crafts pottery mosaics in the style of Pennsylvania's earliest European settlers.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

Frank Lloyd Wright built this suburban synagogue late in life, but it stands among his most iconic masterpieces.

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