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

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

World's second largest particle accelerator, where nature reveals its secrets.

This stunning concert hall has become a symbol of Iceland's national recovery.

These concrete domes were installed on an Icelandic bluff to honor a very specific musical tradion.

This tiny museum's sizable collection is jammed into a former underground public toilet.

A sulfuric martian landscape that looks far better than it smells.

The most powerful waterfall in all of Europe.

This elegant arc of a waterfall marks a religious turning point.

An encyclopedic collection of mammal penises.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

This volcanic cave lake is essentially hard proof that Iceland is the most magical place on Earth.

Once at the center of U.S. finance, the historic Trading Room was meticulously recreated piece by piece and rebuilt in the Art Institute.

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

These mansions date back to Chicago's days as a brewer's paradise.

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

These pretty kitties killed and ate as many as 135 railway workers.

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

This historic hotel invented the chocolate brownie.

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

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

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

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

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.