In 1810, an inn was founded; and during the Industrial Revolution, roads, paths, a harbour, accommodation, a forge, blacksmiths, a brewery, a bakery and a prison were built to cater for the largest number of inhabitants since prehistoric times. Most were quarrymen working in new granite quarries. Several quarries can still be seen at present, such as on the Common. When the Prince and Princess Blücher leased the island from the British government during the First World War, he introduced a colony of red-necked wallabies to the island, around 60–70 in number. They increased up to the First World War, after which they decreased in numbers, and the remaining few were re-captured and put in enclosures.