Skyline of the Grund in Luxembourg City with Neumunster Abbey, Alzette River, Bock Casemates and Church of Saint John

alzette river luxembourg covid covid19 saintjeandugrund old town town panorama europe view grund unesco bock casemates western europe cityview water stierchen bridge church of saint john world heritage reflection landscape no tourists centre neumunster abbey downtown city building no tourism city trip quarantine visit capital no people landmark travel variant skyline must see alone flight outbreak virus nobody pandemic lockdown corona famous coronavirus