Rundetaarn

Rundetaarn
Location within Copenhagen
Former namesStellaburgis Hafniens
General information
Architectural styleDutch Baroque
Construction started1637
Completed1642
ClientChristian IV of Denmark
Design and construction
ArchitectHans van Steenwinckel the Younger
Preview warning: Page using Template:Infobox building with deprecated parameter "style". Replace with "architectural_style".
Preview warning: Page using Template:Infobox building with deprecated parameter "map_type". Replace with "pushpin_map".
Preview warning: Page using Template:Infobox building with deprecated parameter "map_alt". Replace with "pushpin_map_alt".
Preview warning: Page using Template:Infobox building with deprecated parameter "date_demolished". Replace with "demolished_date".
Preview warning: Page using Template:Infobox building with deprecated parameter "caption". Replace with "image_caption".

The Round Tower (Danish: Rundetårn) is a 17th-century tower in Copenhagen, Denmark, one of the many architectural projects of Christian IV. Built as an astronomical observatory, it is noted for its equestrian staircase, a 7.5-turn helical corridor leading to the platform at the top (34.8 meters above ground), and its views over Copenhagen.

The tower is part of the Trinitatis Complex which also includes a chapel, the Trinitatis Church, and an academic library, which were the first facilities of the Copenhagen University Library founded in 1482.