Touching this little fossil embedded in the wall of a grand mosque-cathedral may make your wishes come true.

The remains of this misplaced church were moved here stone by stone.

In the past, Renaissance sex workers were encouraged to entice customers on this bridge.

This beautiful Brooklyn monument over a crypt memorializes a grim and largely unknown story from the American Revolution.

Hidden behind a wall, Spanish nuns distribute their signature sweets on a revolving tray.

Journey through this open museum where even employees remain true to period.

Legend says this mysterious stone head belongs to a woman who was petrified by an alchemist.

The remains of the second-oldest zoo in Europe can be seen within these library gardens.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

Originally a leper colony, the island is now an Armenian monastery that's home to an incredible manuscript library and eclectic museum.

The two writers famously didn't come to blows over the Oxford comma.

The only surviving prototype for Buckminster Fuller's house of the future.

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

This industrial area was the dumping ground for massive amounts of trash, some of which washes up as tiny bits of sea glass.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

A 16th-century Andalusian palace.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

This museum of Hawaiian and Polynesian culture is the legacy of the last descendant of the Kamehameha Dynasty.

This Scottish manor house is a lush relic from the life of a literary great.

This enchanting Victorian estate was home to the world's first hydroelectric power generator.

This uber-quaint Polish village is known for its habit of painting elaborate floral motifs on just about everything.

An enthusiastically interactive mining museum that won't let black lung ruin the fun.

This former luxury resort in Kaua'i is now an abandoned relic.