No one is sure why, but bottles with photographic images of hands have been drifting onto the shores of Clopper Lake in Seneca Creek State Park this summer.

So far, rangers at the Gaithersburg park have found six bottles, which are each about the size of a wine bottle. Each bottle is made of clear glass and has a double-sided photographic image of a left hand printed on thick paper hanging from the cork.

Mystical bottles found in lake