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Explore the secrets of the bastion Sonnenborgh or climb the steps to the star cupolas, where telescopes bring the universe and stars really up close.
Unearth the secrets of Sonnenborgh. Look for cannon emplacements behind the extremely thick walls of the 16th-century fortification. Climb the stairs to the 19th-century observatory domes and gaze at the stars and planets after nightfall. Make a weather forecast or take a closer look at the sun using a special solar telescope.
Sonnenborgh; from bastion to meteorological institute and observatory!
Open: Tuesday through Sunday.