This tour was built in the 1600s (maybe) by one of Denmarks favorite kings. The king had many huge orinate structures built all around Copenhagen. This tour was used for astronomy (thinking of you Deb) and was used by famous leaders from around the world. The walkway up on the inside is wide enough for a team of horses with a carriage to go nearly all the way to the top. The telescope at the top is still used by Copenhagen's astronomy club.