List all the cities that have more than one soccer team that won a European title.
For example: Amsterdam is not a correct answer. Even though Ajax has won various UEFA trofees, there is no other team from Amsterdam that has won any UEFA titles.
European titles are defined as Champions League and its predecessor European Cup since 1955; the Europe League and its predecessors European Cup Winners Cup since 1961 and UEFA Cup since 1971.
See list of winners here: http://en.wikipedia.org/wiki/UEFA_Europa_League, http://en.wikipedia.org/wiki/UEFA_Champions_League, http://en.wikipedia.org/wiki/UEFA_Cup_Winners%27_Cup.