The most famous fortress in Russia is the Kremlin, located in the heart of Moscow. This historic citadel, which has been a symbol of Russian power and culture for centuries, includes impressive architecture, churches, and palaces within its fortified walls. Originally established in the 12th century, the Kremlin has served various roles, from a royal palace to the seat of the Russian government. Its iconic structures, like the Grand Kremlin Palace and St. Basil's Cathedral, attract millions of visitors annually. The Kremlin is a UNESCO World Heritage site, recognized for its historical and architectural significance.