“At first sight, this idea may seem rather bold,” the architect Anton Rosen wrote when presenting a proposal to roll the Round Tower over to the side of the Trinity Church. The proposal was just one of several creative solutions to the increasing number of road users, who passed the tower around 1900.

Listen to the story about the time the 12-year-old choir boy August Nielsen was playing hide and seek in the tower and suddenly disappeared without a trace. Duration: 6:17 minutes Read more about the hollow…