St. Paul's Church (Paulskirche) was the main Lutheran Church of Frankfurt until 1944. But its main role in the history is rather related to religion than to politics. In 1848-1949 it was the seat of the first democratically elected Parliament in Germany - the Frankfurt National Assembly (Nationalversammlung).
The church sustained great damage during World War II, but was restored in 1948. After restoration, it was no longer used for divine worships and has become a museum and cultural center hosting various events. In particular, the Frankfurt Book Fair closing ceremony is held here.