The high point on the 16th president's eponymous roadway is marked by a massive version of his head.

Population: 1.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

This striking art museum holds an amazing series of curiosity cabinets.

A historic beacon built in the aftermath of the worst maritime disaster on the Great Lakes.

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

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.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.

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

This surprising gem is a world-class archeological museum hidden at the University of Chicago.

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

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

Less a museum than a bizarre fantasy world created by artists and engineers.

Known as the "Cross At The Crossroads," this massive metal cross is just short enough to avoid the FAA.

"Call for the doctor, call for the nurse... Vote!! said the lady with the alligator purse."

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

Step inside Lucy, the world's largest "elephant."

This elaborate towering structure was once famed for its revolutionary height.

This statue of the "father of television" stands prominently in the United States Capitol.