The Tønder Museum occupies a purpose-built building in the old town and houses two main collections: the definitive collection of Tønder lace, and a strong assembly of Frisian silverware and applied arts. The lace collection is genuinely remarkable — several hundred examples of needle and bobbin lace from the 17th to 19th centuries, showing the extraordinary skill of the Tønder school and the difference between the various regional styles.
A second building, Drøhses Hus, presents a reconstructed historical interior from the town's prosperous merchant era. Combined, the two venues give a thorough picture of what Tønder looked like — and how its people lived — at the height of its commercial success. The museum has good English labelling and is manageable in about two hours.