The tower was part of a larger defensive circuit that included seven towers and three forts.
During the 19th century, the tower was utilized as a prison facility.
The structure is built primarily from calcareous sandstone, locally known as pietra di cantone.
The tower's design includes embrasures and machicolations for defensive archers and artillery.
It is connected to the remaining stretch of the city walls that overlook the harbor.
St. John Tower, or Torre di San Giovanni, is a 16th-century defensive structure located at the edge of the Alghero old town walls. It was built during the Catalan-Aragonese dominion to protect the city from coastal invasions. The tower stands out for its cylindrical shape and distinct volcanic stone masonry. It currently serves as an exhibition space that frequently hosts temporary art and cultural displays. The interior showcases original structural elements, including its vaulted ceilings and thick defensive walls. It remains one of the few surviving towers from the original medieval fortification system that once surrounded the city.
The perspective from the base of the tower looking up toward the battlements, or from the adjacent pedestrian walk along the sea wall.
Walk the elevated city walls adjacent to the tower for the best perspectives of the coastline.
Check local Alghero tourism boards in advance to see which specific artist or exhibition is currently featured inside.
Combine your visit with a walk through the nearby narrow streets of the historic center.
Do not mistake the modern surrounding street life for the historic site; the interior experience is often brief, so don't plan a half-day stay here.
Exhibitions often pause during the winter off-season; it is best to check for local seasonal updates.
