Clifton Mill in Clifton, Ohio is the site of this Christmas display with over 3.5 million lights.  The water source is the <a href="https://en.wikipedia.org/wiki/Little_Miami_River" class="extiw" title="w:Little Miami River">Little Miami River</a>.
Photographer: Matt Kozlowski
<a href="//commons.wikimedia.org/wiki/User:Moofpocket" title="User:Moofpocket">Moofpocket</a>
CC BY 2.5
<span class="int-own-work" lang="en">Own work</span>