American flag flies over Ehrenbreitstein Fortress on the Rhine during <a href="https://en.wikipedia.org/wiki/World_War_I" class="extiw" title="w:World War I">World War I</a>.
Keystone View Company (copyright)
circa 1919 <div style="display: none;">date QS:P,+1919-00-00T00:00:00Z/9,P1480,Q5727902</div>
photo of stereocard by <a href="//commons.wikimedia.org/wiki/User:Roseohioresident" title="User:Roseohioresident">User:Roseohioresident</a> at village museum in <a href="https://en.wikipedia.org/wiki/Auburn_Township,_Tuscarawas_County,_Ohio" class="extiw" title="w:Auburn Township, Tuscarawas County, Ohio">Ragersville, Ohio</a>