ancient dutch city gate koppelpoort in amersfoort

14th amersfoort ancient arch arched arches architectural architecture arms attraction bridge building buildings built canal century city coat corner country cultural defense defenses defensive destination double dutch eem europe fifteenth fortification fortifications fortified fortress fourteenth gate gatehouse gates gateway heritage historic historical holland image inner koppelpoort land landmark landscape medieval mirror monument national nature netherlands river scene scenery scenic second showpiece sight site summer sunny tourism tourist tower towers travel treadmill utrecht view wall water watere waterfront weather work works