<p>Etappe Spay bis Koblenz; betrachtet und fotografiert vom Aussichtspunkt (Schutzhütte) des Rheinsteig Wanderweg zwischen Osterspai und Braubach. 
</p><p>"Rhein in Flammen" (Rhine in Flames) is the name of five different firework displays along the river Rhine in Germany. The displays take place annually, at various locations along the river. (Source: Wikipedia). 
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Here you can see the firework displays between the locations Spay and Koblenz (the biggest one).
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/82590360@N05">mLu.fotos</a> from Germany
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/luppes777/9572713378/">Rhein in Flammen 2013 - IMG_0034</a>