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

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

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

Arguably the best example of an authentic Dutch windmill in the United States, rivaling its counterparts in the Netherlands.

This house renovated by Frank Lloyd Wright was the centerpiece of a lavish 20th-century estate.

An exhibit of items from the mental institution where Mary Todd Lincoln lived after her son conspired to have her committed.

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

Burial mounds of prehistoric Native Americans who lived along the DuPage River.

Tucked away amongst townhomes lies a restored, early 20th-century tea house and garden, the only remains of a historic estate.

A tribute to one granddaughter's old apartment which now represents the whims of each visitor.

A former atom smasher turned into an art gallery.

Cold War missile launch site which has been converted to a public park.

People escaping slavery passed through the oldest house in Lombard, Illinois on their northbound journey to freedom.

This botanical garden outside Chicago boasts an array of more than 300 varieties of lilacs.

This overgrown Illinois water park offers a whole new type of adventure.

Museum dedicated to the art of cutting and polishing stones.

What may be America's largest classic video game arcade lurks inconspicuously in a Chicago suburb.

A source of civic pride, though the reason for its construction is unknown.

The clothes-washing king doubles as a community center with some unusual features, including an aviary filled with finches.

Chicago’s incendiary role in the labor movement.

The sign to a demolished amusement park now stands in front of a local library.

A plaque marks a former safe house on the secret route, now hidden next to a McDonald's.

One of the finest examples of a black soil prairie that was barely saved by the Great Depression.