Three most important buildings of the vatican city?

Question

What are the three most important buildings of The Vatican City in Italy?

thanks

Answer 1

st.peter basilica, musei vaticani and sistine chapel, palazzo apostolico...

castel gandolfo is out of the vatican state, is a castel of pope outside rome...

Answer 2

Here is the official website of the Vatican City State: http://www.vaticanstate.va/EN/homepage.h...

You choose.

With love in Christ.