The National Museum of Fine Arts is a Rococo palace dating back to the late 1570s, which served as the official residence of the Commander-in-Chief of the Mediterranean Fleet during the British era from the 1820s onwards. The Manoel Theatre () was constructed in just ten months in 1731, by order of Grand Master António Manoel de Vilhena, and is one of the oldest working theatres in Europe. The Mediterranean Conference Centre was formerly the Sacra Infermeria. Built in 1574, it was one of Europe's most renowned hospitals during the Renaissance. The fortifications of the port, built by the Knights as a magnificent series of bastions, demi-bastions, cavaliers and curtains, approximately  high, all contribute to the unique architectural quality of the city.