Una biblioteca de 100

100 blips! When I left this morning I thought I would mark the occasion with a 100. Since I was walking it wouldn't be too difficult to find a number 100 house.
First 100, the sky was still dark. Second 100 passed me by, I must've drifted... Third 100 wasn't there - well, it was there, a pub in Angel, but no 100 on the front door. Fourth and last looked a bit too shabby for a celebratory blip...
On Euston Rd and no 100! British Library to the rescue: I'm sure it's over 100 years old, so here's to many more blips.