In Chicago, a pizza-enthusiast has opened a museum dedicated to the history of pizza.

This tiny historic jail along Route 66 is the perfect fit for exactly one criminal and their partner-in-crime.

First known as the "Sample House," this construction mash-up was meant to be a living catalogue of building styles.

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

A hollow cement depiction of time's inexorable effect on the human body.

A gothic church spire sits atop this skyscraper, the tallest church in the world.

In a quiet north Chicago neighborhood rests a stunning relic of the golden age of earthenware design.

An outdoor urban gallery of large-scale artworks by the world's most influential street artists.

This elaborate Hindu temple is located in a Chicago suburb, but looks like it was transported directly from India.

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

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

A beautiful geyser under environmental threat.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

A display of magnificent stained glass windows is the first exhibit of its kind.

A century-old network of freight tunnels underneath the city's historic business district.

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

This museum celebrating the almighty dollar lets visitors literally stand in the shadow of a million bucks.

This historic hotel invented the chocolate brownie.

All of Chicago's wood-paved streets are long gone but two alleys remain.

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

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

A community of collapsing homes more than a mile out from the Florida coast.

This beautiful Miami garden was designed as a laboratory for tropical plants.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.