An abandoned tuberculosis hospital moulders on into an uncertain future.

A collection of unique outdoor sculptures surounded by the beauty of nature.

A physical catalog of ceramics made by the now-defunct Celadon Terra Cotta company.

The wooden octagon in which Huckleberry Finn and A Connecticut Yankee were born can still be visited in upstate New York.

A renowned Civil War veteran, this Bald eagle now presides over the Wisconsin State Assembly.

Three playfully immersive mini golf courses let you travel alongside your ball to the cup at this facility, which has been around since the 1950s.

A bronze plaque marks the site of the only show the "King of the Soul Singers" ever missed.

An abandoned asylum where patients have been forgotten but their possessions remain.

A deteriorating 1990s Girl Scout camp in a beautiful lush park on Lake Ontario.

The remains of a 19th century spring, and the site of an infamous unsolved murder.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

The oldest continuously operating fish market in the United States.

The tunnel that runs beneath this former inn was once a hiding place for enslaved people seeking freedom.

What appears to be a wizard's lair in Milwaukee actually houses a massive water pipe.

This forgotten beach house built to look like a Frank Lloyd Wright masterpiece overlooks a hidden beach.

A large circus museum with summer performances.

The bugs crawling down the front of this office building are almost as big as a '68 VW Beetle.

A unique botanical garden housed in three giant geodesic domes.

More than 5,000 contemporary and "historic" mustards from around the world.

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

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

Home on the Hillside, and home of the first breakfast cereal.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

This elaborate towering structure was once famed for its revolutionary height.