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Round Tower

Christian IV’s observatory of 1642, climbed by a spiral ramp instead of stairs.

See it in 3D Watch the tour

The Rundetaarn was built in the 1640s as an observatory for the university. Instead of stairs, a broad spiral ramp winds up inside, seven and a half turns, wide enough for a horse and carriage.

Peter the Great of Russia is said to have ridden up it on horseback in 1716. At the top is the oldest working observatory in Europe.

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