Due to the city's unique geology, the Saint Petersburg Metro is one of the deepest metro systems in the world and the deepest by the average depth of all the stations. The system's deepest station, Admiralteyskaya, is 86 metres below ground. Serving 2.15 million passengers daily, it is also the 16th busiest metro system in the world.
Every station has its unique style.
The most beautiful stations are on the red line (Avtovo, Kirovskiy zavod, Ploshad Vosstaniya).
Opening hours: 5.30 am till midnight, check the opening hours here http://www.metro.spb.ru/rejimrabotystancii.html