Loop is the longest platform of the world located in:

Red Square is one of the oldest and largest squares in Moscow, the capital of Russia. Owing to its historical significance and the adjacent historical buildings, it is regarded as one of the most famous squares in Europe and the world. It is located in Moscow’s historic center, on the eastern walls of the Kremlin. It is the city landmark of Moscow, with iconic buildings such as Saint Basil’s Cathedral, Lenin’s Mausoleum, and the GUM. In addition, it has been a UNESCO World Heritage Site since 1990.