A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

This awkward aquarium sculpture is one of the strangest statues in Chicago.

Illegal drag racing two stories beneath Chicago’s streets.

Once called the "Polish Gold Coast" it is an icon of the neighborhood that bears its same name.

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

An antiquated German apothecary on Chicago's North Side.

A frozen relic of Seattle's hydroelectric boom is now a teaching facility for future engineers.

This grand old 80-foot sequoia towers above the buildings in the city’s retail center.

Though strikingly beautiful, Seattle's other railway station is now largely forgotten.

The tech giant built three enormous glass orbs in Seattle so employees could work inside a rainforest greenhouse.

A busy cafe better known for board games than food.

Sweet or salty, super hot or mixed into beer, this is the holy land for all things licorice.

This Puget Sound military post has a long, turbulent history as a gateway to the Pacific.

The only surviving piece of a submarine said to be the most decorated vessel in U.S. history.

A piece of the iconic wall found an unlikely new home in a Vegas bathroom.

Thousands of artifacts relating to human sexuality, including the world's largest sex bike.

An exotic wildlife habitat right off The Strip.

These banned cigarette vending machines now sell little pieces of pocket-sized art.

What is it about mushrooms that makes people wish they lived inside of them?

This painted blacktop brings the classic arcade game to life.

A popular place to pick up prehistoric coral fossils from the time when Michigan was an ocean.

Residents of Fremont in Seattle have considered it the center of the universe since the 1970s.

The first park built over a freeway is a brutalist masterwork.

The small town of Poulsbo in Washington state is the next best thing to the Kingdom of Norway.