The bicycle photo has been in circulation for decades. The young lad who leaned it there died in the First World War, IIRC.
According to this the story of the boy going off to war is not true, but the bike in the tree is real. The picture posted here was taken years ago and recent pictures show much of the bike is now gone, people have been taking pieces.
I note this is in Washington so lots of precipitation probably makes for fast tree growth.