Honestly I was expecting a bit more. The walls are lovely and have great photo ops. Inside there wasn't much that we saw that was very interesting. The Bell was cool and the Armoury was amazing, you definitely want to do that. But mostly it was government buildings, working ones at that and a lot of REALLY busy Churchs that are just like every other nice impressive church out there. Maybe I was just church'ed out. I preferred the outside in Red Square and other things to see in Moscow. I'd recommend a tour otherwise you get nearly nothing out of it in terms of information. Really there was nothing to say don't go, just have lower expectations than me.

very impressive by day and at night it's even more so -- it's lit up like Ghirardelli Square in San Francisco! Heavily treed both inside and out. Lenin's tomb is outside the wall.

Most famous and well known place in Russia.
For buying tickets, I bought at the kiosk, no queue for these buy very very long queue if you are going to the ticket desks.