How long is the Spiral Ramp? How much does the Round Tower weigh? How large is the Library Hall? Get the answers to these questions and learn much more about the measure and weight of the Round Tower here.

Here we offer a quick virtual tour to the tower platform, 34, 8 meters above street level.

The 12-year-old choir boy August Nielsen fell down 25 metres when he was playing hide-and-seek one Sunday in 1880 and strayed into the hollow core in the middle of the tower. Today, one can safely step onto the glass floor in the open recess and look down into the depths that used to constitute Denmark’s zero point.

Join our amateur astronomers for a night of star gazing. During the winter months, the Observatory is open and manned every Tuesday and Wednesday evening from 18 to 21.

Built by King Christian IV and dating from 1642, the Round Tower is one of Denmark’s best-known and most visited edifices.