These curious caverns have been home to mushrooms, gangsters, and disco.

An architecturally-focused antique shop.

This large midwestern cavern features impressive rock formations and an underground waterfall.

Half of a waterfall goes into the river while the other half seems to disappear.

A museum within a museum, devoted to history's most questionable medical devices.

A hundred-year-old museum filled with giant physics toys and experiments designed by grad students.

The museum houses one of the world's largest collections of glass paperweights.

This whimsical sculpture garden is a local treasure.

A unique botanical garden housed in three giant geodesic domes.

Whimsical sculptures dot a woodland path surrounding their creator's old summer cottage.

At this Wisconsin museum there are real ducks, fake ducks, duck calls and a Duck Blind.

A circus of light and sound forms a sensory ode to an iconic train that will never pass through town again.

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

An unassuming house in Wisconsin hides a transient artist’s magnum opus.

Museum with an extensive collection of Cray supercomputers and related artifacts.

This huge stew pot is the focal point of the "Community Soup" event, which honors tradition and soup.

A museum devoted to the victims and the survivors of the most catastrophic fire in American history.

A largely forgotten and touching neoclassical marble fountain overlooking a bear mound effigy.

A 100-year-old chair with joints "cemented by nature."

Small-town museum dedicated to outer space ... and bicycles.

The world's largest woodcarving collection includes dozens of Bible scenes and a wooden bestiary, all carved by one man.

One Austrian's singular yard is now preserved as a folk art garden of concrete wonders.

The spaceship-like theater, which is still in use, was one of the most popular exhibits at the 1964 New York World's Fair.

Before he was America’s most famous preservationist, John Muir was an ingenious mechanical inventor.