strasbourg, france: historical tower of 'ponts couvert' bridge as part of defensive work

famous strasbourg river iii tower ponts couverts france bridge place sight architecture building city defence defensive work europe european historic historical landmark monument old petite quarter couvert protection ill stone tourism tourist town travel winter france: #39aph39#ponts couvert#39aph39# erected 13th century rive #39aph39#petite france#39aph39# waterway estate reflection palace canal castle water vacation tree flower monastery