Moscow's architecture is world-renowned. Moscow is also well known as the site of Saint Basil’s Cathedral, with its elegant onion domes, as well as the Cathedral of Christ the Savior and the Seven Sisters. The first Kremlin was built in the middle of the twelfth century.
Medieval Moscow's design was of concentric walls and intersecting radial thoroughfares. This layout, as well as Moscow's rivers, helped shape Moscow's design in subsequent centuries. The Kremlin was rebuilt in the 15th Century. Its towers and some of its churches were built by Italian architects, lending the city some of the aura of the renaissance. From the end of the 15th century, the city was embellished by increasing numbers of masonry structures such as monasteries, palaces, walls, towers, and churches.