A science teacher's dream.

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

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

An antiquated German apothecary on Chicago's North Side.

A lush green oasis in the middle of Chicago.

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

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

A monument to the art of slicing people open.

A giant bronze coil of feces is both a tribute to doggie defecation and a reminder to pick it up.

A speakeasy takes on Chicago's drinking culture.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

For almost a century, this East Village newsstand has served egg creams to beats, hippies, punks, and everything in between.

A graffiti Mecca welcoming artists from around the world.

Walk over a 150 year old manhole.

Tucked in the back of this amazing antique store is an important piece of medical history.

A strip of modern stores in historic buildings.

On this island, you suck away your garbage via an elaborate pneumatic tube system.

This Bronx apartment building is officially recognized as the birthplace of hip-hop.

Michael Jackson got Bad and Crocodile Dundee walked on heads in this iconic Brooklyn subway station.

One of the few Glatt kosher delis in the United States is a cornerstone of its Hasidic neighborhood.

Seriously good slices of Sicilian pizza lurk at the back of the Bronx's oldest enclosed market.

These ornate manhole covers were used for a now-forgotten purpose.

Gang fights don't just happen on the streets, they happen under them too.

This micro-industry of Latino cuisine along Red Hook's Ball Fields represents a victory in a food fight with the city.