Ehy, guys... Is it correct in English?

Hi guys!! I'm an Italian guy and for my English class I was asked to describe my favorite picture...

This is my description:

My favorite picture was taken two years ago during my holiday in the USA. I decided to go there because I have a couple of friends in Boston and they invited me to spend some time with them. We were visting the city and I stared at all the skyscrapers of the city. They were wonderful. I particularly liked one which was really tall and beautiful.

That summer was the best summer I've ever had, especially because of all the wonderful things I visited, such as Trinity Church (a big, gothic church), the old and the new house of the Government (really beautiful and ancient), Plymouth Plantation and so on. The picture is on my bedroom wall because each time I feel a great nostalgia of America or of my friends, I look at it and I remember how great the time was that spent there. I hope to go back there one day.

Could you correct it if there's any mistake? Thank you in advance...

P.S: I know that in this piece I'm not talking a lot about the pic and I'll correct it as soon as possible, but is it grammatically correct?

10 points to the best and clean answer!