historical city hall in the old town offrankfurt at the river main

architecture facade building arch landmark town window iron downtown street city road historical hall old offrankfurt river main germany cellar ratskeller architecture building german germany house stone street town history historical city down downtown old town place hessen main frankfort frankfurt river spring town main historic panorama scenic front facade half timbered timbering timber frame framed spring park cityscape historic europe front facade tree river hall roemer flag römer square landmark famous