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

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

This mountain fissure hides a secret path to a secluded mossy grotto within the rock itself.

Twisted girders are all that remain of an Icelandic bridge that was wiped out by a combination of volcanic heat and glacial floods.

Three columns of volcanic rock shoot out of the ocean.

This wrecked airplane has been sitting on a black sand beach since the 1970s.

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

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

This beautiful, historic church looks like something out of a simpler past.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

Iceland's "Smoky Valley" is a beautiful river that is shrouded in a constant cover of steam clouds.

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

This stunning concert hall has become a symbol of Iceland's national recovery.

The "lovely red Vega" of the legendary record-settling pilot.

The first home of the doomed aviator Amelia Earhart.

Four, 18-foot-tall badminton shuttlecocks lie scattered about the lawn of a Kansas City museum.

A huge musical instrument played by the ocean.

Olfactory delights in San Francisco's Botanical Gardens.

Golden Gate Park's historic collection of plants.

The United States's largest hand-dug well is topped with a state-of-the-art museum.

Tribute to the famous Notre Dame football coach who died in a plane crash.

A museum documents the development of the invention that tamed the Wild West.

It's big, it's a ball, and it's made of twine—the world's largest of its kind.

A faithful reproduction of Al-Jazari's enormous water clock.