The St. Petersburg Metro is a rapid transit system serving the city of St. Petersburg, Russia. Opened in 1955, it features five lines and over 70 stations, making it one of the busiest metro systems in the country. The stations are known for their unique architectural designs, often resembling underground palaces. The metro operates from early morning until midnight, providing efficient transportation for both residents and tourists. Trains run frequently, with intervals of about 2-5 minutes during peak hours. The system is an essential part of the city's public transport network, connecting various neighborhoods and key attractions.