metal fence barrier restrict rheintreppe, famous staircase at burgplatz and promenade riverside of rhine river.

architecture ban barrier burgplatz care caution city close corona covid crisis deutschland distance düsseldorf empty epidemic europe fence forbidden german germany health landmark lockdown north nrw old outdoor pandemic people plaza prevention prohibited protection quarantine restriction rheintreppe rhine risk river riverbank riverside safety security shutdown social square stair staircase tourism town travel waterside westphalia