Places Yukon Joe Wants to Go

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

A hiking area billed as a possible home to Bigfoot.

This scenic gorge is named after one of the most famous Bigfoot attacks in pseudohistory.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

Giant pinnacles in the sun-scorched lands of Southern Utah have been nicknamed "white ghosts."

Rippling sand dunes frozen in the Arizona rock.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

A terrific purveyor of natural history objects and curios.

A huge musical instrument played by the ocean.

These enigmatic ruins continue to vex archaeologists.

The enigmatic skull gazes out over the ruins of a once-great Mayan city.

The enigmatic and seldom visited ruins of a Mayan city-state.

Three small rooms in the jungle house the most elaborate and intact murals of the Mayan world.

Where the White Nile River dramatically cascades between Lake Kyoga and Lake Albert in Uganda.

The world's widest single drop waterfall, and the two men who legend says went over its edge in a boat.

This "floating island" plateau sits 7,671 feet above the forest floor.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

A lonesome Moai stands in a small Italian town some 9,000 miles away from its Easter Island brethren.

Virgil's many-mouthed gateway to the underworld.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

A steep and winding road in the Yorkshire Dales passes by these deep natural potholes.

A seemingly endless landscape of pure salt stretches far across Bolivia.

Natural time capsule containing an alien ecosystem.

Three wildly colorful calderas top this otherworldly volcano chain.