Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

A beach made of semi-precious green sand on the Big Island of Hawai'i.

The only thing sweeter than the potatoes is the canine proprietor of this roadside stall.

This abandoned sea fort has become an accidental bird sanctuary.

One of the largest artillery pieces in the world sits in a Washington D.C. parking lot.

Obelisks and stone pineapples in the Irish countryside.

The abandoned village of Skarð aptly illustrates the idiom "Don't put all your eggs in one basket."

An auroral research program that superheats the ionosphere.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

Rising from the sea like a stone monster.

This decommissioned DC-3 now forever points into the oncoming wind.

Walk in the footsteps of the gods and straddle two tectonic plates.

A dangling church built over a Colombian gorge.

Ice roads, deep holes and 3,500 pounds of diamonds.

As the highest point in the Mid-Atlantic range this stratovolcano offers spectacular views.

An explosion of natural color known as "the river that ran away from paradise."

The closest thing to Mars on Earth.

340 bicycles, 65 feet high.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

Where the alchemists dream of transmuting base metal into gold was actually achieved.

From the Difference Engine to the Cray-1, all under one roof.

Small Island off the coast of Greenland.

Sleep snuggled in a sphere suspended atop the forest canopy of Vancouver Island.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.