One of the steepest streets in the United States makes an intriguing challenge for cyclists.

The most confusing clock in New York.

Elevated freight railway turned wildly successful urban park.

In the middle of downtown Brooklyn lies a 165 year old secret hidden right below the surface (closed to the public indefinitely).

The largest source of fossilized insects anywhere.

The largest earthwork effigy in the world.

A terrific purveyor of natural history objects and curios.

A layered tribute to the work of mosaicist Isaiah Zagar.

First a horse rendering plant, then a 19th century landfill, this beach is full of glass from thousands upon thousands of broken bottles.

A giant Troll lurks under one of Seattle's oldest bridges.

A walk through the historic city center, under the streets of Seattle.