When you talk about a place, how can you refer to it afterwards? Does the pronoun "it" exists?
I would like to say something like:
Last week, I went to Milan. It is a big city.
Is it correct to say:

La semaine antérieure, je suis allée á Milan. Elle est une grande ville.

Question

When you talk about a place, how can you refer to it afterwards? Does the pronoun "it" exists?
I would like to say something like: 
Last week, I went to Milan. It is a big city. 
 Is it correct to say:

La semaine antérieure, je suis allée á Milan. Elle est une grande ville.

Answer

You should say:
La semaine dernière, je suis allée à Milan. C'est une grande ville.

In this case, you can replace "it is" by "c'est"

Answer

By the way, there is a lot of pronouns, but not just one like "it". "ceci" is "this", "cela" and "ça" is that (they all replace the word you used before). For example "I like it" is "j'aime ça". They would become "ce", "cet", "cette" if put before a noun. (Ex: J'aime ce livre)

Answer

careful, "à" with a forward accent doesn't exist in French.