A fountain standing as a testament to a doomed alliance.

A marvel of Byzantine engineering under the streets of Istanbul.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

The world's most active stratovolcano is almost always erupting.

A mysterious ancient elephant said to possess magic powers is now the symbol of a Sicilian city.

Every inch of this chapel is covered in craftsmanship from across the world.

According to Greek mythology, this natural spring is the home of a freshwater nymph.

Italian cave with exceptional acoustics and an unsavory history.

The man who wasn't there.

A modernist landscape of water and sci-fi concrete.

A replica of a Dutch windmill in honor of those who settled in the region from the Netherlands.

One incredible room in the Santa Barbara Courthouse is covered in wall-to-wall canvas murals.

Happy harbor seals frolic and snooze on this warm, sandy stretch of coast.

Explore more than 130,000 new and used books in the "world's largest outdoor bookstore."

Legend has it the lovelorn tears of a princess and a shepherd boy formed the blue and green twin lakes in the Azores archipelago.

The "Little Ones," show Portugal in full miniature splendor.

One Portuguese poet described this cape, the westernmost point in mainland Europe, as "where the land ends and the sea begins."

Europe's oldest still-operational tea farm also boasts a spectacular view.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

The world's oldest bookshop still in operation.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

This abandoned five-star hotel is now a five-star urban exploration destination.