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

Museum dedicated to the art of cutting and polishing stones.

Half-sized replica of the Leaning Tower of Pisa built to honor Galileo.

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

A science teacher's dream.

Nonprofit art center that promotes outsider, intuitive, and self-taught art.

A little-known subterranean street runs under some of the best-known buildings in Chicago's River North.

A Museum of Holography frozen in 1974.

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

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

These pretty kitties killed and ate as many as 135 railway workers.

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

This bronze sculpture on a former squash court marks the secret origins of the Atomic Age.

What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.

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

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

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

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

Modeled after a famous church in Vienna, Austria—but in Helena, Montana.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The highest point in Montana is as rugged and singular as the state itself.

These giant metal horses graze on a hilltop near the Montana highway.