This Texas windmill field celebrates the power and majesty of the very winds that blow.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

See massive fossils that are over 200 million years old in northeastern Arizona.

A burnt orange monolithic dome structure perched on a hillside near Interstate 280.

A house built from trash known as the poor man's Hearst Castle.

The world's first permanently occupied mountain-top observatory continues to report on the stars.

One of the largest free-standing structures ever built, this dirigible hangar is now simply a giant skeleton.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Concrete strongholds stand guard over the Golden Gate.

A pair of giant roadside arrows are all that remains of a former Route 66 trading post.

A building so large that it has its own weather.

The final resting place of soldiers' loyal canine companions.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

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

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.

Enter the world under the hill at this ancient UK burial chamber.

Possibly the oldest of Britain's ancient henges is also one of its most stark.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

The world's largest piece of copyrighted artwork.

The bears may be gone, but their old cages can still be found.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.