In the center of Saint-Petersburg, the place where the Neva river changes sharply its destination and forms a beautiful bend one of the most unique Russian temples is located. The Smolny Cathedral is a grandiose project of the architect Rastrelli and a world-famous masterpiece of Russian baroque. It was built for the empress Elizabeth, this is where she planned to pass her old ages and to take the veil. The presenter Diana Pylaeva climbed up to the bell tower, the highest observation deck in city and walked down r ight under ground. To the basements. This is where Diana Pylaeva learned where the secret passage under the Cathedral led and even managed to guess a riddle of the bunker of the Great Patriotic War.