Kalkara is an unofficial fourth member of the so-called Three Cities, nestling inside the creek on the eastern side of Birgu. Although excluded from the Cottonera group of cities (Vittoriosa, Senglea and Cospicua), it shares the same historical and economic background, a dependence on all things maritime and an important role in wartime. Kalkara has its own strongholds. Nearby Fort Ricasoli, a massive fortress at the entrance to Grand Harbour, was built in 1670. The smaller Fort Rinella is a late 19th century British addition to the harbour's fortifications. The area between the forts houses the Mediterranean Film Studios. At the head of Bighi Peninsula is the old British Royal Naval Hospital, used today as a school for restoration studies. Kalkara Creek is also known as 'English Creek', a link which dates back to the time of King Henry VIII. Kalkara itself retains the air of a sleepy, picturesque fishing harbour. Behind the small boat yard at heart of the creek, is an entrance to the Great Ditch in the Three Cities' fortifications. From here, a path winds through an olive grove up to Vittoriosa.