One of the great places in Prague is the top of the City Hall Tower in the Old Town on the main square.  Weather permitting you get phenomenal views of the city and some of its great landmarks.  The Prague Castle, the Tyn Church, Vyšehrad Castle, The opera house, the many churches, and turrets and building and hundreds and hundreds of people and today also a lot of brides and grooms.  The weather is perfect and the views are simply breathtaking.  It is a postcard moment from the top of the tower.