Huge abstract sculptures of the Puerto Rican Flag.

This abstract sculpture is rumored to cast a hammer-and-sickle shadow once a year.

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

This alley in downtown Chicago held the bodies of over 600 people after the fateful Iroquois Theatre fire.

A shining sculpture made of 3,115 lights, the number of visible stars in the Northern Hemisphere.

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

When you visit his grave, be sure to rub the Great Emancipator's nose for good luck.

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

This historic hotel invented the chocolate brownie.

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

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

These ancient sacred grounds granted amnesty to those who managed to reach them.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

The massive, incredibly rare instrument is over 11 feet tall with a range so deep it goes lower than humans can hear.

The world’s largest truck stop includes a barber shop, chiropractor, and a huge museum with antique trucks.

Lined with plaques and tributes to veterans, this patriotic street was founded by Mexican immigrants.