Liverpool Hospital was founded on a portion of land beside the Georges River, making it the second oldest hospital in Australia. Fairfield railway station was opened in 1856 and has the oldest surviving railway building in New South Wales. Quarrying in the Prospect area began in the 1820s and naturalist Charles Darwin visited Prospect Hill in January 1836, to observe the geology. Designed and constructed by the NSW Public Works Department, Prospect Reservoir was built as Sydney's main water supply in the 1880s. The Upper Nepean Scheme was commenced in 1880 after it was realised that the Botany Swamps scheme was insufficient to meet Sydney's water supply needs. By the latter part of the nineteenth century coarse-grained picrite, and other dolorite rock types were being extracted from William Lawson's estate on the west and north sides of Prospect Hill.