Salo has been a place of rural commerce since at least the 1500s. It became a market town in 1887 and a city only in 1960, and then at the start of 2009 it absorbed nine neighbouring municipalities whole: Halikko, Kiikala, Kisko, Kuusjoki, Muurla, Perniö, Pertteli, Suomusjärvi and Särkisalo. Several of those names come with Swedish twins that are still in use locally: Perniö is Bjärnå, Pertteli is S:t Bertils, Särkisalo is Finby. The result is a municipality of more than two thousand square kilometres in which the built-up centre is a small fraction of the whole. Salo means woodland or wooded island in Finnish, which may refer to an island that stood south of the present town a thousand years ago, before land uplift turned the seabed into fields. Drive ten minutes in any direction and the name still fits.

The single most striking building in the centre is not the market square or the modern library, handsome as that is where it sits among the old wooden houses. It is Uskela Church, standing on high ground above the town. Carl Ludvig Engel designed it — the architect who gave Helsinki its neoclassical heart at Senate Square — and it was completed in 1832, with the tower added in 1860. There had been a medieval chapel on the site; it came down in 1830 and its stone went straight into the new walls, which is either thrift or a kind of continuity depending on your mood. Engel's church and the old Lukkarinmäki quarter below it were together designated a nationally significant built environment in 2009. Below both, the Uskelanjoki river runs through the centre under the local name Salonjoki, and it is worth seeing after dark, when the water takes the town's lights.

Out at Kisko, on the eastern shore of Kirkkojärvi lake, stand the ruins of Haapaniemi — one of the oldest noble seats on this coast, built somewhere between about 1450 and 1525. Krister Frille is the first owner on record, in 1463; it was the principal estate of Henrik Klaunpoika Horn until the 1540s and passed to the Flemings late in the following century. The Great Northern War finished it. What survives is the vaulted cellar level, built of grey stone with slate vaults quarried from Hyypiänvuori nearby, excavated in the 1910s under Juhani Rinne and consolidated between 1950 and 1958. An eighteenth-century wooden manor house with a mansard roof still stands close by. You descend a few steps into cool air beneath vaults five centuries old, and there is nobody there at all.

Some twenty kilometres south-southwest of the centre, in the old Perniö district, three ironworks villages sit along the shore of Halikonlahti bay: Teijo, Kirjakkala and Mathildedal. All three began as heavy industry and all three have been reinvented. Mathildedal is the liveliest — the works closed for good in 1978 and the site stood empty for nearly twenty-five years until Tuula and Harri Gustafsson bought it in 2003. The old ironworks manor is now a restaurant, the former transformer building an exhibition café, and the harbour takes pleasure boats. There is a hotel, a small brewery, a bakery, a coffee roastery and a chocolate workshop, and since 2012 a spinnery turning alpaca fleece into yarn. About 130 people live there year-round, many of them running the businesses. Teijo National Park begins immediately to the east.

Every train between Helsinki and Turku stops at Salo, which makes this one of the easiest Finnish towns to reach without a car — Wikivoyage's own advice is not to be misled by the timber stacked beside the station, because this is the high-tech city. The ordinary express coaches on the Turku–Salo–Helsinki run call here too, though the non-stop expresses do not, and between coaches and regional buses there is something in each direction once or twice an hour for most of the day. Salo lies just south of the E18 motorway, 120 kilometres from Helsinki and 50 from Turku. Local bus timetables and a journey planner are published by the city, and mobile tickets work through the Waltti app or Matkahuolto's Routes and Tickets. Then, if you have any sense, you rent something with wheels and go find the King's Road.