This 200-meter-high waterfall marks the site of Achilles’s immortal baptism at the mouth of the River Styx.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

According to myth, Zeus himself was hidden in this cave to escape being eaten by his dad.

The oldest cemetery of modern-day Athens blends the modern and ancient worlds.

Giant marble phalluses on the sacred island of antiquity.

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.

Witnessing the might of this dessert-colored desert waterfall is a rare, powerful treat.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

Dramatic river bend surrounds a natural red-rocked pedestal.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

Most-visited and most-photographed slot canyon in the American Southwest.

This private home is famous for appearing in the cult-classic "Twin Peaks" series.

This large Sitka spruce that appears to be floating in mid-air, has defied logic for years.

This long, dark tunnel is open to hikers, but those without lights are known to get confused even on the straight path.

A surreal landscape where fanged rocks rise from the ground and the ocean feels like a great mystery.

Twin Peaks' real life Double R Diner has been restored to its damn fine television look.

Peruse rare tomes like poetry bound in pearls or books with branches and berries growing out of their spines.

Rustic natural hot springs in the deciduous rain forest.

A tiny red pebble marks what may be the quietest outdoor spot in the United States.

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

Stroll through a wonderland of stupendous moss-covered trees.