Hobart is the capital city of the Australian state of Tasmania. Hobart is small and intimate (population 250,000) compared to larger mainland Australian cities, reflecting the small size of the state. The metropolitan area stretches north and south along the Derwent River, crossed by several bridges. It has a mild temperate oceanic climate, with four distinct seasons. Two main methods of transport in Hobart are by private car or by public bus. Hobart has a sufficient public bus system. The main interchange is in front of the GPO (General Post Office). Ticket prices depend on the distance and start slightly above a dollar. Because Hobart is small, riding a bike is always an option, although factors such as Hobart’s mild climate and considerable distance from many of Tasmania's main attractions should be taken into consideration when staying in Hobart as a tourist. Walking is also a good option. Between the City Centre and Sandy Bay is less then an hour walk. On a Saturday, avoid using a car around the Salamanca area because of the market. The are no passenger trains in Hobart. Founded in 1804 by Colonel David Collins, Hobart is the second oldest city in Australia. It grew out of the penal settlement on the island at Risdon Cove, eight kilometres up river, which was founded in 1803 and abandoned five months later for the present site of Hobart. The city has many beautiful historic buildings and precincts, especially in the area around the river. There are many fine examples of Georgian and Victorian architecture, such as Salamanca Place, which has a terrace of warehouses dating back to the whaling days of the 1830's. Nearby Battery Point, the original seamen's quarters of the city and Macquarie and Davey Street offer more than 60 buildings classified by the National Trust.