Walk the whole Mississippi River!

More than five miles of underground passageways.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

Better known as the "Body Farm," this unique research facility has been studying how human bodies break down since the 1980s.

All that's left of the quintessential "cabin in the woods."

Home of an evil witch famous within southern folklore.

You can climb to the summit of Black Mountain, as long as you sign the waiver.

Outstanding collection of 19th century medical instruments includes a life-size figure cast from as many as 200 cadavers.

A ship that lived many lives under many names is now known merely as the "Ghost Ship."

This former tuberculosis research hospital endeavored to cure the dreaded disease with fresh air and positive attitudes.

The world's longest known cave system.

This elaborate Hindu temple is located in a Chicago suburb, but looks like it was transported directly from India.

Chicago's North Park Village was once the largest municipal sanatorium in the country.

A display of magnificent stained glass windows is the first exhibit of its kind.

The subtle science of a master molecular gastronomist.

A haunting statue called "Eternal Silence" has quite the reputation among visitors with active imaginations.

An antiquated German apothecary on Chicago's North Side.

A monument to the art of slicing people open.

A waterfall 600 ft. inside a mountain, once the bane of gold miners, is now a spectacle of nature.

A place where the laws of nature seem to have gone completely berserk... but of course haven't.

An ever-growing collection of rare and strange objects owned by local Arkansas illusionist Maxwell Blade.

At Oklahoma Panhandle State University, a plaque marks a place once known as No Man's Land in the linear world and the fictional Kcymaerxthaere as well.

A peculiar forest that was handcrafted for government experiments.