Former meatpacking facility turned vertical farm and sustainable business complex.

This surprising gem is a world-class archeological museum hidden at the University of Chicago.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

A massive marble foot is tucked away in a small alley near the Pantheon.

Once a favorite playground for the world's most illustrious guests, Hotel Nacional's secret weapons and bunkers reveal a more menacing side to its golden history.

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

In terms of history and architecture, this is one of the most remarkable cemeteries in the world.

A Cuban artist reclaimed his impoverished neighborhood as a dreamy folk art kingdom.

The first modernist church in Europe.

This grand manse has been transformed into a museum devoted to one of the founders of Fantastic Realism.

The housing complex served as an anti-fascist fortress during the Austrian Civil War.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A wonderfully curated used bookstore in an airport.

This striking art museum holds an amazing series of curiosity cabinets.

This Buffalo museum hides an Art Deco gas station designed by Frank Lloyd Wright.

This former hub for crafty philosophers was founded by a writer who died aboard the infamous RMS Lusitania.

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

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

Created by four famous men, the beautifully designed Buffalo State Asylum was resurrected as a hotel and art center, but still boasts a ghost story or two.

This forgotten Frank Lloyd Wright house is an architectural marvel at the end of a sleepy residential street.

This hilltop park offers magnificent views and a Frank Lloyd Wright masterpiece.

Six tiny houses built for working class people form the largest intentional cluster of Wright homes anywhere.

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

This unique crypt designed by Frank Lloyd Wright for his longtime friend was not completed in either man's lifetime.