The following year the building, which is situated a few doors down from the Bluetown court house, became the Criterion Public House, with a music hall called the "palace of varieties" situated immediately to its rear. In 1879 the building was replaced with a brick structure. On 5 June 1917 the Criterion was badly damaged by a German air raid. Shrapnel marks from the attack can still be seen in the dockyard wall opposite the building. After the air raid, the building was re-built in its present form retaining some of its original features. After a variety of other uses, the site became the Heritage Centre in January 2009. A special exhibition in 2014 commemorated the centenary of World War I.  Sheerness is a commercial port and main town of the Isle of Sheppey and owes much to its origins, as a Royal Naval dockyard town. Samuel Pepys established the Royal Navy Dockyard in the 17th century. Henry VIII, requiring the River Medway as an anchorage for his navy, ordered that the mouth of the river should be protected by a small fort. Garrison Fort was built in 1545. Sheerness was the focus of an attack by the Dutch Navy in June 1667, when 72 hostile ships compelled the little "sandspit fort" there to surrender and landed a force which for a short while occupied the town. Samuel Pepys at Gravesend remarked in his diary "we do plainly at this time hear the guns play" and in fear departed to Brampton in Huntingdonshire. The dockyard served the Royal Navy until 1960 and has since developed into one of the largest and fastest expanding ports in the UK. The Port of Sheerness contains at least one Grade II listed building, the Old Boat House. Built in 1866, it is the first multi-storey iron framed industrial building recorded in the UK. Decorated with ornate ironwork, it features operating rails extending the length of the building, for the movement of stores, much like a modern crane. The dockyard and port at Sheerness today are a significant feature of the Isle of Sheppey's economy, which includes the extensive export/import of motor vehicles, and a large steel works, with extensive railway fixtures. The island is, however, suffering from an economic recession and these industries are not as extensive as they once were. The area immediately outside the dockyard was occupied by dockyard workers, who built wooden houses and decorated them with Admiralty blue paint illegally acquired from the dockyard.