This black cat was actually designed to ward off bad luck.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

A kaleidoscopic warehouse-maze of handmade neon signs.

An archive of ceramic eggs painted to record clowns' personal makeup designs.

An enormous, inside-out glass globe built in 1935.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

The original Garfield station is the oldest station facility on the "L", with the station house dating from 1892.

These chunky stone towers out in Lake Michigan are the key to Chicago’s drinking water.

A goddess-topped water fountain in Chicago was created thanks to the dreams of a thirsty newsboy.

Where old school Polish Chicago and young hipster Chicago live side by side.

The iconic Chicago sculpture hides a beautiful and easily overlooked plaque on the backside.

Where Cusack's record store from the film "High Fidelity" was located.

A beloved Chicago music venue offering cold beer and lots of “Friendly."

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

One of the largest pieces of scientific equipment ever carried on a NASA space shuttle sits in a Chicago alley.

An outdoor urban gallery of large-scale artworks by the world's most influential street artists.

The site of the first couple's first kiss is commemorated by the most adorable presidential monument ever.

Internationally known record store and purveyor of "dusties."

These abandoned grain silos and tunnels are an urban exploration dream.

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

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

This unauthorized stone mermaid was secretly carved out of public stone before being permanently preserved.

Hot Doug's "Hot Dog" Stand.