Lavrion Mineralogical Museum
Even if you're just drifting through, this small mineralogical museum is worth a stop to get a gist of the history of the area. Its 700 exhibits—including several rare and beautiful specimens such as laurionite and azurite—are housed in a charming late-19th-century building once used by the French Mining Company to wash minerals. Coins made from the silver that the ancient Greeks mined around Lavrion are also on display.