What is an example of dramatic irony in Act III, scenes 3-4 of "Romeo and Juliet"?

Another example of irony is in Romeo's lament before Friar Laurence in Act III:

There is no world without Verona walls,/But Purgatory, torture, Hell itself./Hence banished is banished from the world./And world's exile is death.  The "banished,"/Is death mistermed. III,iii17-21)

There are two instances of irony in Romeo's remarks.  First, he states that it is Purgatory and Hell itself to be outside Verona when within the walls of the city he has been hated all his life by the Capulets, and he has committed an act of murder. 

In another instance, Romeo declares that being banished is "torture and not mercy," but

...Heaven is here,/Where Juliet lives, (III,iii,29)

He thinks that if he could stay in Verona, he would be in "heaven," but he does not know yet that Juliet is so upset over Tybalt's death.