The museum on Castle Wynd covers the natural and human history of the Highlands with more depth than you might expect from a city this size. Exhibits range from Pictish stones and Jacobite relics to displays on Highland wildlife and the history of the Gaelic language. The art gallery upstairs shows a mix of Scottish and Highland artists, with changing exhibitions throughout the year.
Admission is free, and the museum makes a good starting point for understanding the region before heading out to places like Culloden or Cawdor Castle. The museum shop has a decent selection of books on Highland history and culture.