When the Town of York was surveyed in 1793, it occupied ten blocks between the harbour and present-day Adelaide Street. Everything a Toronto City Hop On Hop Off Tour passes today grew outward from that rectangle. The loop boards at 1 Dundas St E, a corner now anchored by Yonge-Dundas Square, cleared and rebuilt in the early 2000s. Daily service runs 09:00–16:40, tracing a route the city itself drew: water at the foot, the Davenport ridge at the top, the grid stretched between. Toronto is the fourth-largest city in North America and among the most linguistically varied, with more than 180 languages spoken within its boundaries. Its landmarks refuse to cluster. The CN Tower rises 553.3 metres from former railway lands at the waterfront. Casa Loma sits four kilometres north, built between 1911 and 1914 on the ridge of an ancient shoreline. The Distillery District occupies the 1832 Gooderham and Worts brickwork on the eastern edge of downtown. An open-top double-decker route is the rare vehicle that treats these as one city rather than five separate errands. Toronto City Hop On Hop Off Tour tours pass a near-complete catalogue of the city's architectural centuries. Old City Hall, 1899, Romanesque Revival in Credit Valley sandstone, its clock tower deliberately offset to close the view up Bay Street. New City Hall, 1965, two curved towers by Viljo Revell wrapped around a council chamber shaped like a saucer. St. Lawrence Market, whose south building absorbed the 1845 council chamber of the young city. The Royal Ontario Museum, opened 1914, with Daniel Libeskind's aluminium and glass crystal grafted on in 2007. Queen's Quay Terminal, a 1927 cold-storage warehouse now holding galleries and apartments. Water remains the organizing fact. Dredging and landfill pushed the shoreline nearly half a kilometre south of its 1793 line, which is why a single Toronto City Hop On Hop Off Tour tour now crosses blocks that were once lakebed. The Toronto Islands, severed from the mainland by a storm in 1858, lie fifteen minutes offshore. Seen from the water, the towers close into one continuous wall. It is a reading of Toronto landmarks that no street corner can offer, and the reason so many sightseeing itineraries end at a dock rather than a kerb.