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

A wall of chewing gum moonlights as collective art.

This working class sculpture pounds his hammer all the livelong day.

The Denny Substation has been called "the coolest substation in the world" and sits in a densely populated Seattle neighborhood.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

A bronze of the man in all his sinewy glory celebrates his longtime connection to the Ohio city.

This huge pile of volcanic boulders hides a stunning network of secret grottoes.

The land is home to swimming ponies and a legendary 18th-century treasure.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

Did Inca children also slide down these smooth rocky slopes above Cusco?

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

This midcentury LA bar was the birthplace of tiki culture.

World's largest Christmas store.

Turnip-shaped island just off the Michigan shore in Lake Huron.

The highest point in Alabama was almost completely deforested, but is now home to protected towers and trees.

Electrical pylon in the shape of Disney's beloved mouse.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

This natural Icelandic fissure allows divers to swim right between two volatile tectonic plates.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

Medicinal spa created with the discharge from a geothermal energy plant.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

Three columns of volcanic rock shoot out of the ocean.

A classic Route 66 landmark that was built with scrap lumber and is held together with kitsch and puns.

A pair of giant roadside arrows are all that remains of a former Route 66 trading post.