A replica viking ship from the Chicago World's Fair is still in dry dock in an Illinois park.

The final resting place of the world's first nuclear reactor.

First planned industrial community in the United States.

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

River pirates, murderous bandits, and serial killers used this Illinois cave as their debauched hideout.

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

Cemetery featuring rare glass-fronted columbarium.

All of Chicago's wood-paved streets are long gone but two alleys remain.

Chicago's largest cemetery is full of beautiful Victorian monuments and more than a few ghost stories.

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

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.

Shop of curiosities with a dinosaur museum tucked in its basement.

An antiquated German apothecary on Chicago's North Side.

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

An enormous park-like oasis, full of famous Chicagoans' graves.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

This memorial to the Mercury Seven astronaut stands at the site of his former elementary school.

One of the world’s largest living advertisements is made out of pine trees.

An unknown number of cholera victims are buried in two nondescript graves.

A chapel built by Italian POWs during World War II tells a forgotten tale of the war on the home front.

The large rock formation where the Shawnee prophet Tenskwatawa stood and encouraged his warriors during the Battle of Tippecanoe.

The massive, original Colgate Clock is mounted on a defunct factory building that was once a prison.

This former Indiana quarry has been transformed into a park and SCUBA site where divers can explore the drowned mining equipment.

The lynching and burial site of America's first train robbers.