This natural wonder is disappearing at an alarming rate.

The main gates have been locked since 1745 and will remain so until the Stuart Dynasty returns to the throne.

The only presidential monument to display a late POTUS's actual casket.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

For thousands of years, Native American hunters drove buffalo straight off this cliff in Montana's Yellowstone Country.

This tiny island featuring 9th-century Viking ruins is only accessible at low tide.

In DeWitt, New York, a blanket-wrapped gas station makes a creative statement on global dependence on oil.

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

An urban laboratory.

A spiritual vortex among the red rocks in Sedona.

A reversed traffic signal that was once violently misinterpreted as a statement on British-Irish relations.

Abandoned rock quarry now a haven for mountain bikers and hikers.

This Art Deco fortress in upstate New York gives Manhattan's vaunted examples of the style a run for their money.

Surprisingly aquamarine waters fill deep lakes formed at the end of the last ice age.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The last physical evidence of the Lewis and Clark trail is one of their autographs etched into this giant rock.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

This ancient Irish tower could easily have stood in for Rapunzel's prison.

The ancient tomb acts as a calendar that keeps perfect time.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.