Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

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

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

A little-known subterranean street runs under some of the best-known buildings in Chicago's River North.

At Chicago's revered Field Museum, visitors are invited to learn about and literally explore DNA.

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

Years of archaeology, just chillin' by the water cooler.

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

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

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

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

This historic hotel invented the chocolate brownie.

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

A Bibliophile's Dream.

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

A lush green oasis in the middle of Chicago.

This morbid, delightful curiosity shop offers everything from animal bones to human teeth.

A hot dog stand where the heads are just as hot as the dogs.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

Try not to get slimed in Tribeca.

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

This hand-carved wooden carousel in the Story City North Park was built in 1913.

This tiny site in Iowa, part of a patchwork national wildlife refuge, is home to ancient flora and fauna.

Largest gathering of hobos in the country has been meeting annually since 1900.