The Kremlin mainly looks at the church complexes in the central square. Ticket sales and online ticket exchange are at the Alexandria Garden subway exit. The ticket office is more complicated, and different tickets correspond to different windows. Buying tickets on the spot is the innermost window, and there are more people in line. Several windows outside (about 5-7 window) are exchanged for online tickets and purchased tickets for the weapons library and Diamond Foundation. It is recommended to go to the official website to buy first, because there is basically no queue for the exchange window. Arsenal tickets must be reserved for a time slot, but the Diamond Foundation can now enter directly without going through the Arsenal library (go straight to the gate at the southwest corner of Alexandria Gardens after buying tickets at the ticket office). In addition to winter, there is a performance of the Presidential Guard in the center of the square every Saturday noon, which is very cool. It is best to go to the front row of the square around 11:30. The brigade inside the complex cannot take pictures, please note.