Take a tour of San Leo Fortress in Italy – part of the World’s Greatest Attractions travel video series by GeoBeats.

The fortress of San Leo, in northeastern Italy, occupies a prime defensive location.

The main building cuts a knife-thin profile across the sheer cliff-top.

The fortress was the final prison for Count Cagliostro, who was put to death by the Spanish Inquisition.

The cliff, which has provided the fortress with its key defense, has also caused its structural problems.

Landslides, throughout its lifetime, have necessitated repairs and restorations on the fortress of San Leo.

Thanks to the constant work, the fortress has remained intact for over 1000 years.