The Knocknagael Boar Stone is a large Pictish symbol stone dating to around AD 600, dominated by the outline of a wild boar with bristles, spirals, and other carved symbols. It originally stood south of Inverness but is now protected inside the Highland Council headquarters, where the carving can be seen without exposing it to more weathering.
This is a specialist sight, but a rewarding one if you are tracing the Pictish and early medieval history of the Highlands. The stone is less theatrical than Clava Cairns or Culloden, yet its animal carving is direct and memorable. Check viewing arrangements before making a special trip, since it is displayed in a civic building rather than a conventional museum.