Frauenkirche
The Church of Our Lady, or Frauenkirche, is the main cathedral in Munich.  Somber in appearance, other than it's sheer size, it does not stand out so much.  It is however the tallest structure in the downtown area, with the towers towering 100m, or 328 feet, over the city.  The church was built in the mid-15th century, and the green Renaissance domes were added in 1525.