At Chicago's revered Field Museum, visitors are invited to learn about and literally explore DNA.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

A science teacher's dream.

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

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

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

This Elizabethan hedge maze is one of only six in North America.

Statues of Ramona Quimby, Henry Huggins, and Ribsy the dog in the park where their adventures "really happened."

This Cold War missile launch site has been abandoned for 40 years.

A huge musical sculpture and other art installations on the National Oceanic and Atmospheric Administration grounds.

A collection of odd-shaped and quirky sounding instruments handmade by a midcentury inventor-composer.

A medical facility that has been kept frozen in time.

This remarkable collection devoted to the study of fish includes 1 million preserved specimens from all around the world.

Allowing humans and fish alike to migrate from freshwater to saltwater and back again.

A young botanist's horticultural vision realized through a lifetime of planting, tending, and collecting seeds.

Activists are fighting to preserve these unfinished highway ramps as a tribute to the citizen revolt that halted their construction decades ago.

42nd story Pyramid shaped penthouse tops Seattle's oldest skyscraper.

Seasonal, Pacific Northwest cuisine served in a 101 year old firehouse.

Old submarine parts have been converted into faux whale fins.

A "sinister, whimsical, tacky, and really orange" public art installation hidden under a Seattle bridge.

At just six feet two inches deep, it is said by Guiness and Ripley to be the world’s narrowest freestanding office building.

A unique spiral staircase that doesn't quite make it up to the top floor.

Locals transformed this Canadian evergreen into a secret hangout with spectacular views of Vancouver's skyline.