Ye olde town hall

Dun Laoghaire Town Hall has quite a few old relics from Queen Vic's time when it was called Kingstown. 
You still see the odd crown around the town if you look up, around, and closely enough. 

So, crown, ship because it has a harbour, a martello tower as there are a few of those up and down the Dublin coast, and I'm afraid I can't remember what the top left one is supposed to be.