These enduring murals depicting a distinctly Marxist tribute to capitalism could not even be defeated by McCarthyism.

The only surviving prototype for Buckminster Fuller's house of the future.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

The Beaux-Arts aquarium boasts a vast collection of saltwater and freshwater fish on an island in the Detroit River.

This sprawling bookstore spans four floors and has more than a million books in stock.

Part of a secret 1970s nuclear defense program is now open to the public.

This sky-high radio mast is formerly the tallest man-made structure in the world.

The oldest still-existing mosque in the United States sits in a remote prairie in North Dakota.

One North Dakota man's vast collection of rare rocks, polished orbs, and geological wonders.

These former Cold War launch sites have been preserved for tourists to see where the button might have been pushed.

One man's quest to save his town with a trail of record-breaking sculptures.

Dedicated to the history of the 1,000 nuclear missiles that once covered the Great Plains.

An entire city block built completely out of petrified wood.

One of the world's most definitive collections of musical instruments, spanning all cultures and historical periods.

This geodesic gallery holds a collection of painted spheres that make traditional canvases look lazy by comparison.

A fitting attraction for the corn capital of the world.

One of America's first dinosaur parks gives a window into Depression-era paleontology.

Just a man taking his prehistoric pet for a stroll.

A roadside collection of over-sized iron creations that are a bit more macabre than most.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

A take-out restaurant that only serves cuisine from countries with which the United States is in conflict.

One of the oldest Catholic churches in the U.S., situated just east of Gettysburg.

The residents of the Neighborhood of Make-Believe live without much fanfare within the Pittsburgh Children's Museum.