A huge musical instrument played by the ocean.

Elevated freight railway turned wildly successful urban park.

Rippling sand dunes frozen in the Arizona rock.

Less a museum than a bizarre fantasy world created by artists and engineers.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

The site of a classic series of Laurel and Hardy pratfalls.

Hundreds of hidden passageways weave through the old quarters of Lyon.

Stairs often replace streets on the steep slopes of this old mining town.

A stairway to heaven, or to nowhere at all.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

Spanning an elevation of 160 feet and containing 388 steps, this is Seattle's longest staircase.

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

An artsy hidden staircase leads to breathtaking views of San Francisco.

Their motto is, "We've been bonkers for hats even longer than you have!"

Seemingly unremarkable items like empty sushi trays, chef hats, and freshness stickers are being preserved so future generations can look back on this beloved cultural import.

This quaint museum tells about more than just the birth of Jesus: "betlémy" are an important piece of Czech history.

A collection of retro plastic goods made with "the material of a thousand uses."

The home-turned-museum of Barış Manço, the mustachioed Turkish Elvis for children.

A collection of 1,300 accordions of all shapes and sizes displayed in chronological order.

An abandoned bus station transformed into a museum dedicated to the history of Greyhound Lines, in the place where it all began.

One man’s passion for gas stations is on display along the Rio Grande in northern New Mexico.

The largest collection of historical roller skates in the world.

Camera cars and condom bikes built from scrap and one man's passion.

The only museum dedicated to the history of the "Magic Lantern," a medieval slide projector.