One of the oldest libraries in the world is still operating and contains the oldest existing document in the Italian language.

A gorgeous example of 13th-century Gothic architecture.

Pilgrimage site for star-crossed lovers.

A whale rib was used to advertise the store by the arch that offered exotic goods from far away.

This small Catskills village has six independent bookstores and more bookshops than restaurants.

Hundreds of years ago, this lion-shaped door knocker could help a person accused of a crime find temporary safe haven in Durham Cathedral.

This Victorian water wheel is affectionately nicknamed "Little Isabella."

Golden plates containing what would become the Book of Mormon were believed to be buried on this New York hillside.

A field in which God and his son Jesus purportedly appeared to a young farm boy named Joseph Smith.

A near tragic event on this bridge helped inspire the classic film "It's a Wonderful Life."

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

This elaborate High Victorian Gothic structure is one of the world's few 16-sided buildings.

These barriers stand as stark reminders of Northern Ireland's troubled past.

This ancient castle has been abandoned since the Edwardian conquest of Wales.

At one of Berlin’s oldest churches, visitors can place mosaic tiles to help restore a medieval mural.

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

Eclectic architecture in the woods of New York.

The real-life site of Ichabod Crane's infamous gourd attack.

This astronomical clock is the second oldest in England.

This hill and tower are steeped in legend, from King Arthur to the Holy Grail.

This New York estate was designed to resemble a medieval Scottish castle.

This 1920s Dutch barge is now a floating bookstore.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

This intriguing Bronze Age artifact spent centuries hidden within a Welsh faerie hill.