Something's watching you.

Nine centuries-old fortresses guard the walls of this medieval Romanian city.

Once an opulent Art Nouveau hotspot, the Constanța Casino is one of Romania's most beautiful abandoned buildings.

An incredibly salty lake inside the crater of an extinct volcano.

A pristine medieval church that was visited by Columbus before his travels to the Americas.

This local emblem is the oldest and largest dragon tree in the Canary Islands.

This secret coastal village is studded with pastel-colored houses all piled on top of one another.

The oldest olive tree in Greece has been bearing fruit for at least 2,000 years.

This stone tower was built to protect Crete from incoming pirates.

The remains of a military communications outpost still stand on this Greek island.