The Moscow Kremlin is a historic fortified complex in the heart of Moscow, easily accessible via multiple metro stations, making it a major tourist destination. Visitors can explore independently, but a guided tour is highly recommended for historical context, or an audio guide can be rented. The Kremlin is open year-round, with winter visits being cold and summer offering larger crowds; spring and autumn provide pleasant weather. Allow 3-5 hours for a comprehensive visit covering the grounds and at least one main museum like the Armory Chamber; visiting both the Armory Chamber and Diamond Fund could extend this to 5-7 hours. Approximate costs include separate tickets for the grounds (700-1000 RUB), Armory Chamber (around 1000 RUB), and Diamond Fund (around 800-1000 RUB), with guided tour prices varying. It's advisable to book tickets online in advance, especially for popular attractions like the Armory Chamber and Diamond Fund, to secure entry and avoid long queues. Be prepared for thorough security checks and wear comfortable shoes for extensive walking.