Completed in 1494, this huge church and its two domed towers are a fixture in the annals of Munich's history (as well as its skyline). Despite taking severe damage, the cathedral was fully returned to its former glory by 19994. Take in the Alps and the city from the full height of the towers, which are exceptional because there isn't much to block your view due to local building restrictions. The basement crypt contains the remains of local royalty; otherwise there aren't too many unique aspects to the interior to compel further exploration. If you do plan on going in, there is no fee for entrance.
Note:The Frauenkirche is on Marienplatz, Munich's central square and a prime place of cultural interest.