I was very surprised when I did a google street view walk around Washington Sq Park in NYC and looking at the apartment building I lived in as a teen, amazingly not only could I see it, but the foot tall letter “R” I mortared onto the bricks outside our kitchen window around 1974 is still there 40 years later!
I remember mixing the cement and troweling on with my arm snaked around the window which opened out, and forming the letter backwards to me and somewhat “blind” as I couldn’t reach far enough out to see what I was doing very well.
This is pretty cool.
