The best examples of the Celtic settlements (called "Castros") are found in the northern Minho province, notably Citania de Briteiros close to the city of Guimarães. Here are well-preserved ruins and several buildings (stone dwelling huts that were built in circular or elliptical shapes) that have been restored. One of the most arresting artifacts recovered from Briteiros is a slab of carved stone thought to have been the front of a funerary monument, and can be seen, together with other sculptural remains, in Guimarães' Martins Sarmento Museum. Closeby is the region of Terras de Basto, where there are statues believed to represent Celtic warriors. Another site is Sanfins de Ferreira, close to the city of Porto, where there are traces of a triple ring of defensive walls around 100 huts and a small museum. In the town of Viana do Castelo are also traces of a Celtiberian settlement by the Hill of Santa Luzia, with remains of walls and circular stone huts. Town names ending in "briga" (like Conimbriga or Mirobriga) also date back to these times, as well as more than 200 granite pigs or boars (some up to 6ft/2 meters in length), found throughout the Tras-os-Montes province