I live in a conservation zone in a bog-standard, totally unremarkable terrace house built in 1893. I have this sign on my house so that visitors know that in 1897, nothing happened here and so I prevent any confusion. Actually, between 1893 and now, not much happened. It's pretty boring.  I like it that way.

You, too, can shout out  to the world that not much has happened at your house and that there's nothing to see with this hefty vintage-style cast iron sign. 
 
This  cast iron sign can be permanently screwed into a wall. Or you can use the two holes to hang it on a doorknob or nail, which is probably more sensible.