The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

A tunnel with windows, so you don't miss out on the impressive views.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

The language and heritage of a nearly forgotten culture can still be explored in this Southern enclave.

On Hilton Head Island this bronze King of the Sea rules all things briny—and lets you know if you’re late for lunch.

On a clear day, you can see all the way to the Virgin Islands from the top of this observation tower built in the 1960s.

Site of the greatest known waterfall that ever existed.

Every drop of water in this 27-mile long reservoir was pumped up from the Columbia River using power from Grand Coulee Dam.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

This hunter-gatherer architecture is believed to be the oldest religious complex known.

The ancient abodes are a testament to human ingenuity amid harsh climates.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

While not Turkey's deepest underground city, this subterranean redoubt is the largest.

This ancient subterranean megalopolis is known for the hot oil traps that were installed above each of its entrances.

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

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

Surrounded by ash fields in Iceland, an impossibly verdant valley looks like something out of a fairytale.

Inside this Icelandic greenhouse, geothermal energy keeps tomatoes warm and growing.

Travel deep inside of Europe's second largest glacier in the world's largest man-made ice cave.

The final resting place of the controversial chess champion.

A replica of the decorated wooden pillars Viking sailors threw overboard when finding new places to establish a settlement.

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

Iceland's first pagan temple in 1,000 years is underway in Reykjavík.

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