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

The center of the only hemisphere that awards visitors with a commemorative coin.

Vikings and Evangelicals have both had a hand in this replica medieval church.

This pebble beach is so beautiful that taking its rocks is against the law.

Amateur taxidermy museum known for its large collection of white squirrels.

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

The arboretum whose marshy soil sucked up the dreams of housing developers.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

The spot where the namesake of the Douglas fir met his mysterious end on a Hawaiian volcano.

The world's longest known cave system.

A trailblazing sovereign nation tucked in the American state of Wisconsin.

A chilling disappearance (and rescue) of a child uncovers a geological mystery.

The site of a 19th century "dream city" that almost rivaled Chicago before being swallowed by the Indiana sand dunes.

What was once the second largest steel mill in the US is now a sprawling complex of modern ruins.

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

This old steel industry company town has a tradition of parking cars on the sidewalk so people can walk in the narrow streets.

One of Chicago's last seafood smokehouses perfects a dying breed of fishcraft.

First planned industrial community in the United States.

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

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

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.

One of the largest pieces of scientific equipment ever carried on a NASA space shuttle sits in a Chicago alley.

This modest post office sits on the site of H.H. Holmes' famous murder castle.