If you’re searching for a day-trip destination, we’ve got a couple of tips. Situated 16 miles away, Gluecksburg is worth the drive. See the best sights beginning with Flensburg Harbor, Gluecksburg Castle and Solitude Beach. Don’t forget about Flensburg either! Just 20 miles away, Flensburg Harbor, Gluecksburg Castle and Solitude Beach are must-sees here.