Copenhagen
Visit Vor Frelsers Kirke (Church of Our Savior) on Christianshavn. This gorgeous baroque church dates back to the late 1600s and has a golden corkscrew spire. What really sets it apart, though, is the opportunity to climb up to the top. The spiral is a staircase that starts at a large viewing platform and gradually narrows. Intrepid visitors can scale the 400 steps while taking in an amazing view of the city.