Powder Tower - Prague/Czech Republic - 65 metres high -186 stairs in the spiral staircase. It was a gate to Prague in the middle ages. It was built in a ditch around the town´s ramparts, about 9 metres below the present ground. The future kings of Bohemia used to enter the town through this gate when they were on their coronation parade. This parade went on the traditional Royal Way to the Prague Castle, where the coronation took place.