This 6th-century church has the largest and best-preserved collection of Byzantine mosaics outside Constantinople.

This picturesque Umbrian city has a subterranean side that has long remained hidden.

Thanks to both terrific preservation and historic vandalism this ancient site is known as the "Heart of Neolithic Orkney."

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

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

Chicago's North Park Village was once the largest municipal sanatorium in the country.

This landmark of the Chicago silent film industry may not be in the picture business anymore but it still stands proudly.

Experience what life was like in Ireland during the Viking and medieval ages.

The only Frank Lloyd Wright-designed structure in the architect's hometown.

These pretty kitties killed and ate as many as 135 railway workers.

A bizarre house filled with an astounding array of collections.

Famously misunderstood wonder of the ancient world

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

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

The most loyal of little dogs, or a Victorian era publicity stunt?

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

Largest lake in Great Britain measured by surface area.

A turn-of-the-century architectural marvel built on healing mineral springs and salt licks.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

A science teacher's dream.

Theater has had many different incarnations but has survived the ravages of time.

Nonprofit art center that promotes outsider, intuitive, and self-taught art.

A Bibliophile's Dream.

Hot Doug's "Hot Dog" Stand.