I'll be in Rome the end of September, and I'd like to visit Castel Sant' Angelo on a Sunday. So I have a few questions regarding tickets:
1) Are advance tickets necessary?
2) If so, what's the best on-line site to buy them? I understand some sites are re-sellers. I'm not sure if I should use them or the official site, and I'm having difficulty finding an official site.
3) One of the sites I found offered tickets in a variety of configurations: skip-the-line tickets; skip-the-line tickets with hosted entry; and skip-the-line tickets with hosted entry and audio guide. What is hosted entry? I don't believe it's a guide, since the third option is an audio guide.
Any advice on visiting Castel Sant' Angelo is appreciated.