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

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

The city of Rockford, Illinois is symbolically protected by a quartet of fittingly stony sentinels.

The face of a woman pushes its way through the earth.

A Museum of Holography frozen in 1974.

Its eclectic exhibits range from the world’s first motorcycle to Luke Skywalker’s Land Speeder.

In the Shawnee National Forest, amazing rock formations peer through the treeline.

This freshwater spring fills with 10,000 gallons of water per minute.

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

A remnant of the last Ice Age, this lake is surrounded by fascinating rock formations.

A lush green oasis in the middle of Chicago.

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

A mythical bird etched into the face of a rock doubles as the mascot for a nearby school.

This unique zoo is the only place in the world where you can see all 15 species of crane.

It was originally part of a "terrible lizards" collection at the 1964 New York World’s Fair.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

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

A fitting attraction for the corn capital of the world.

This head-spinningly bizarre Depression-era art cave is wall-to-wall quartz and Jesus.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

Tour the luxe "glass cage" that inspired and unnerved the architecture world upon its debut.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

The home made famous by the 1983 holiday classic is now a perfectly preserved shrine to the movie.

This Mediterranean castle was built for a millionaire and his giant dog.