This historic cliffside mansion uses a natural cave for air conditioning.

The house where the famed outlaw was shot by a dirty coward is now a museum to the criminal's legacy.

A mysterious light of unknown origin on the backroads of Missouri.

The show pony of cave systems, Fantastic Caverns manages to live up to its name.

If there's another drive-through golf-cart bar in a bat-filled cave on top of a mountain, we don't know about it.

Community bookshelf of 25-foot-tall book spines.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

The history of the treatment of mental illness, illustrated in all its gory detail, and housed in an asylum.

This abandoned prison castle has become an imposing gallery of graffiti art.

European castle ruins in an American state park are actually the product of death and grief.

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

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

Designed by Alfred Caldwel, this landscape showcases his vision of a native garden.

The oldest house in Chicago certainly doesn't look the part and there are some who say it doesn't deserve its title either.

A military museum and library dedicated to the citizen soldier.

Orthodox church partially financed by Tsar Nicolas II.

Small and slightly hidden, the American Writers Museum is preserving the legacy of America's finest authors.

One of the last functioning antique elevators in Chicago.

Assemble a masterpiece at the first and only North American school exclusively dedicated to mosaic art.

The 30,000-volume library is one of the world's most impressive poetry collections.

These mansions date back to Chicago's days as a brewer's paradise.

In a quiet north Chicago neighborhood rests a stunning relic of the golden age of earthenware design.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

This surprising gem is a world-class archeological museum hidden at the University of Chicago.