Last stop before the top of the highest peak in the world.

This black shoreline is made up of exploded lava particles.

This former luxury resort in Kaua'i is now an abandoned relic.

Watch the newest land on the planet form before your eyes.

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

A series of waterfalls and pools that flow through the 'Ohe'o Gulch and into the ocean.

A former major munitions plant that has been converted into a sprawling art space.

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

At 207 feet, one of the world's longest continuous escalators.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

God's Saharan sandbox of wrath.

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

A marvel of Byzantine engineering under the streets of Istanbul.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

This famous city eluded concrete detection until the early 2000's.

The alleged house of the Virgin Mary is tucked away in a park and nature preserve on Mt. Koressos in Turkey and is holy to both Catholics and Muslims alike.

The ancient latrines of the Greeks, in all their public glory.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

Roman ruins top white travertine terraces formed by ancient hot springs.

Visit the monolithic tomb of America's most famous general.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

Mysterious 500-year-old tapestries depict a unicorn hunt.

A beautiful geyser under environmental threat.