• Free entry on Mondays, and closed every Tuesday
• Allow at least two hours, the museum's own estimate for the two exhibition floors
• Touchable replicas of some of the most interesting pieces, with a visitor lift and accessible toilets on every floor

More than 1,000 pieces of Baltic amber fill two floors of the Great Mill, a medieval mill built by the Teutonic Knights. The first floor shows how amber forms, with lumps holding creatures trapped more than 40 million years ago, among them the world's largest spider found in amber. The second covers amber craft, from a 330-year-old chess set to modern jewelry. Each floor has a kids' corner with puzzles.