What is "aalholm"

Aalholm, also Aalholm Castle , is a castle and country estate in Nysted in the municipality of Guldborgsund, on the south coast of the island of Lolland, Denmark. It is the oldest castle on the island, first mentioned in the 1329. The main building was built in 1300–1585, with major rebuilding especially in 1768 and in 1889 under Hans Jørgen Holm and Gotfred Tvede. Inscriptions in the building show that it was originally completed in 1585.