A long lost multi-cultural music venue used to reside in the bottom floor of Chicago's Flat Iron Building.

Not to be confused with the iconic New York City skyscraper, this Chicago building is a vibrant hub for artists.

A Bibliophile's Dream.

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

A monument celebrating the idea of reaching inaccessible places.

Every equinox this Maya pyramid puts on a spooky ancient light show.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

This playground sculpture of an icon from the past is dedicated to the children of the future.

This inanimate goat created by the "welding nun" has been helping to clean up the city of Spokane for more than 40 years.

The world's longest known cave system.

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

Once known as the Illinois Asylum for the Incurable Insane.

This softly rounded mansion was built without corners not to avoid evil spirits, but to make them more comfortable.

More than 5,000 contemporary and "historic" mustards from around the world.

Tour the luxe "glass cage" that inspired and unnerved the architecture world upon its debut.

This cemetery is all that remains of a school for "wayward" girls.

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

Arguably the best example of an authentic Dutch windmill in the United States, rivaling its counterparts in the Netherlands.

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

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