Valdemars Slot, built between 1639 and 1644 by King Christian IV on the island of Tåsinge near Svendborg, represents Denmark's largest private residence and the only former royal palace in private hands. Designed by architect Hans van Steenwinckel d.y., this grand 17th-century manor sits between forest, beach, and sheltered coastal lagoon, historically home to naval hero Niels Juel. Open to the public since 1974, Valdemars Slot features historic interiors, contemporary art exhibitions, a chapel, toy museum, and the Iuel-Brockdorff family's maritime museum and trophy collection. Public footpaths traverse its scenic woodlands and coastline, and the castle operates May through early autumn, accessible from Svendborg via the historic veteran ferry Helge.