The NARROWEST STREET in AMSTERDAM is the Trompettersteeg at only 100 centimeters wide.
Well, it is really more like a tiny alley way between two houses with an official street name hidden from street view. I walked pass it twice and completely missed it.
It is part of the red light district so no further photos are allowed.
If you are interested, this street is about 10 minutes walk from Amsterdam Central Station toward de Oude Kerk. Check out the art on the walls!