In Chicago, a pizza-enthusiast has opened a museum dedicated to the history of pizza.

What was once one of the country's largest confectionary plants is now an abandoned ruin, but is still pretty sweet.

A Museum of Holography frozen in 1974.

A century-old network of freight tunnels underneath the city's historic business district.

This small, but long-running hobby club has built one of the largest model rail lines in the US.

These pretty kitties killed and ate as many as 135 railway workers.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

This unauthorized stone mermaid was secretly carved out of public stone before being permanently preserved.

A monument to the art of slicing people open.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

The whole of Maine's history with the salty little fish is packed into this tiny coastal museum.

Accessible only by boat, this centuries-old island fort never saw troops or combat.

An elderly widow still operates the incredibly detailed model railroad she and her husband built by hand.

Steam engines and conveyor belts are remnants of a genius system left in the middle of the Maine woods.

The debris forms a solemn memorial to those who died in a 1963 accident.

This uninhabited island in Maine is home to various works of art left by visitors over the years.

Toy museum in a former tavern is the expression of one man's life pursuit of the aesthetic power of cartoon imagery.

This tiny patch of arid sand sits in one of the greenest states in the United States.

These light, hollow rolls have been linked to Acadia National Park since the 1890s.

Tucked away in a corner of a Maine general store there was a museum devoted to an equally beloved and reviled local soft drink.

A showcase of geologic history is home to one of the largest collection of lunar meteorites on Earth.

An 18th-century home taken over by antique automatons and musical machines (Closed).

Located in the historic home of a newspaper publisher, this museum is dedicated to the Freedom of Speech.

This waterfront museum in Maine is dedicated to the history of the smoked-herring trade.