There are many megalithic tombs and ogham stones in the county. The Viking influence can still be seen with Reginald's Tower, one of the first buildings to use a brick and mortar construction method in Ireland. Woodstown, a settlement dating to the 9th century was discovered 5.5 kilometres west of Waterford city. It was the largest settlement outside Scandinavia and the only large-scale 9th-century Viking settlement discovered to date in Western Europe. Other architectural features are products of the Anglo-Norman invasion of Ireland and its effects.