The Levice district in Slovakia has the largest area. Important historical sites mentioned include Levice Castle from the 13th century, the Tekov Museum located at the castle documenting the region's history and culture, and unique rock dwellings carved into tuff in Brhlovce serving as former homes and protection. The document also describes the Bohunice water mill dating to the 19th century used for milling grain, the memorial room in Zeliezovce where composer Franz Schubert taught music, and Franz Sacher's birthplace where the famous Sacher cake originated.