This historic hotel invented the chocolate brownie.

Stroll through a wonderland of stupendous moss-covered trees.

The bugs crawling down the front of this office building are almost as big as a '68 VW Beetle.

This sprawling bookstore spans four floors and has more than a million books in stock.

In Chicago, an empty relic of a time when neighborhood zoos were more common.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

The world’s largest street art museum.

A lush green oasis in the middle of Chicago.

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

This old-fashioned confectionary has been family owned and operated for more than a century.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

The cutest way to stay safe in traffic.

The world's largest bicycle shelter can hold more than 12,500 two-wheelers.

'The Letters of Utrecht' lays out a ribbon of poetry one letter at a time, with no final verse in sight.

In 2004, a Dave Matthews Band tour bus dumped 800 pounds of waste off a bridge and onto an unsuspecting tour boat below.

The rodent-shaped sidewalk imprint that earned worldwide media attention.

One of the last remaining World War II Victory Gardens in the U.S. is quietly growing across from Fenway Park.

In 1958, an MIT fraternity pledge laid down on this bridge and instituted a new, unique unit of measurement.

The first home and studio that belonged to the famous architect.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

Illegal drag racing two stories beneath Chicago’s streets.

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

Wisconsin's most celebrated export gets the royal treatment on I-94.

Hot Doug's "Hot Dog" Stand.