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

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

A beautiful geyser under environmental threat.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

The first declared National Monument in the United States.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

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

An enormous, inside-out glass globe built in 1935.

Rippling sand dunes frozen in the Arizona rock.