One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

How did the right arm of a 13th-century English bishop wind up in a Connecticut church?

In the ruins of Glastonbury Abbey lies the alleged resting place of the legendary king.

The medieval woodcut-style artwork chronicles life in medieval London.

This colorful and fiery mural depicts the Irish folk story of the beloved hero Cuchulain.

Thousands of pieces of art have been carved into the rock at the site of an ancient volcanic eruption.

The final resting place of the living embodiment of the famous Forest Service symbol.

This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

This pseudo-steampunk weapons facility is the world's largest wood and glue structure, and packs quite a wallop.

A preserve with 75,000 ancient drawings remains the realm of public – not just scientific – exploration.

Life-sized sculpture of a blue whale made of hand-recycled plastic trash.

Despite time, colonization, and the brutal New Mexican heat, these Pueblo ruins still stand.

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

In the remote high desert of New Mexico, a strange array of poles beckon fury from above.

Legends surround this jagged rock formation in the New Mexico desert.

A multi-storied adobe complex has been inhabited for more than a thousand years.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

There's nothing shrimpy about the world's largest artificial prawn.

More than 21,000 images fill this overlooked gem of a prehistoric site.

Wee (and not so wee) footprints that insects and reptiles of the Paleozoic Era left behind.

At this research institute, the chile is king.

Patrick Dougherty's fantastic living tree sculptures, mind-blowing but temporary.

A holy well believed to have healing powers.