As Frankfurt is considered the European financial centre, this striking Euro sign monument somehow belongs here. Chances of your overlooking it are slim because it is 14 meters tall. The place where the sculpture is installed is symbolic of course as the European Central Bank building is situated right behind it.
Wikipedia (German) http://de.wikipedia.org/wiki/Euro-Skulptur
Coordinates 50°6'32.064" N 8°40'23.053" E