Qolla l-Bajda Battery was built by the Order of Saint John in 1716 on the spur of land between the bays of Xwejni and Qbajjar. It was named after a nearby hillock known as Qolla l-Bajda (the White Hillock). It was designed by the military engineers Jacques de Camus d'Arginy and Bernard de Fontet.
The battery is the only surviving part of a chain of fortifications that defended Marsalfornand nearby bays from Ottoman or Barbary attacks. The other towers, batteries, redoubts and entrenchments were all demolished or destroyed.
It was initially armed with six guns, but in 1770, its armament consisted of four 6-pounder guns with 276 rounds of roundshot and 60 rounds of grapeshot.
The battery was abandoned in the 19th century, but was again used as Observation Post No. 5 during World War II.
In 1978, the government leased the battery to Francis Vella, and it was converted into a discotheque and snack bar. At this point, some structures were built on the gun platform, the entrance was enlarged, and the ramp leading to it was replaced by a flight of steps. After the lease expired in February 2003, the company continued to occupy the battery, but later on it was subsequently abandoned and it fell into a state of disrepair. The area around it, including the salt pans, is also in a dilapidated state.
The NGO Din I-Art Helwa has asked for permission to take over the battery and restore it. In response, the Superintendence of Cultural Heritage made a request to the Land Department, which issued an eviction order against the former lessee in 2007. Since then, the battery has been in the midst of a legal battle between the government and the company.
Source: wikipedia.com
Look for the cache in the area of the smaller building on the right.