A unique botanical garden housed in three giant geodesic domes.

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

More than 5,000 contemporary and "historic" mustards from around the world.

A bronze plaque marks the site of the only show the "King of the Soul Singers" ever missed.

Hidden away in the city of Madison, Wisconsin is a nearly forgotten home that Frank Lloyd Wright built for a childhood friend.

Prayers and messages of hope decorate the ceramic tiles of this pavilion.

The last masonry skyscraper ever built reveals a transitional moment in architectural history.

Huge abstract sculptures of the Puerto Rican Flag.

A spectacular remnant of an Adler and Sullivan masterpiece that was destroyed in 1972.

This historic Illinois "Muffler Man" has been converted from axe-touting lumberjack to rocket-wielding space ace.

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

A historic and oft-filmed prison stands in a Chicago suburb.

This memorial plaque remembers a strangely shallow maritime disaster known as "Chicago's Titanic."

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

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

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

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

This historic hotel invented the chocolate brownie.

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

A monument to the art of slicing people open.

A stone marker memorializes the spot where the King broke up a street fight with a classic karate stance.