Tower of Ca l'Alsina Monument · Montgat, Maresme, Barcelona The Torre de Ca l'Alsina, in Montgat, is a defence or watchtower that formed part of the 14th-century farmhouse of Ca n'Alzina, demolished in 1987. It was added to the house in the 16th century, when it was owned by the Matheu family, and first appears documented in two wills of 1592 and 1593. With an apsidal plan, straight on one side and semicircular on the other, it is about 11.5 metres high, with a ground floor and two upper storeys; it retains the machicolation corbels and a simple drainage gargoyle. The original access was through a postern on the first floor, today replaced by a ground-level door. Like other towers on the Catalan coast, it was built to defend against pirates, and was visually linked to the towers of Can Canyadó, in Badalona, and of Ca l'Umbert. Photo: Enfo (CC BY-SA 3.0) What to see and do in Montgat