The world's longest known cave system.

One of the few surviving "Wigwam"-themed motels.

Moonbows over Kentucky.

The first KFC is on the National Register of Historic Places.

America's post-nuclear-attack chambers of Congress.

This monument honors the band's impromptu performance at Cadillac highschool's homecoming decades ago.

The farm where one of America's greatest leaders was raised is now a well-appointed landmark.

A hidden grotto on the grounds of the Kane County Government Center.

World's second largest particle accelerator, where nature reveals its secrets.

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

The study has wall paneling from a 17th century ship.

This sprawling mini-golf empire is an impressive testament to a disappearing attraction.

The first American woman to win the Nobel Prize in literature came from the foothills of Appalachia.

Pizza with a side of fine art.

Take a steam-powered ride straight out of the past on this Appalachian rail line.

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

The beloved home to all publications indie, erotic, and punky.

Combination beer garden and music venue in the heart of Wicker Park.

Odd, decrepit fountain honors Chicago author who had mixed feelings about his hometown.

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

A bloodstain from "the wound of the transverberation of the heart."

Home to a protest movement, a bombing, and a dramatic change in labor history.

This historic house museum that celebrates one of the world's most influential social reformers is also one of the most haunted locations in Chicago.

Rifle through images of skyscrapers, Worlds Fairs, and more in the largest public postcard repository in America.