The Peter and Paul Cathedral (Russian: Петропавловский собор) is a Russian Orthodox cathedral located inside the Peter and Paul Fortress in St. Petersburg, Russia. It is the first and oldest landmark in St. Petersburg, built between 1712 and 1733 on Zayachy Island along the Neva River. Both the cathedral and the fortress were originally built under Peter the Great and designed by Domenico Trezzini. The cathedral's bell tower is the world's tallest Orthodox bell tower. Since the belfry is not standalone, but an integral part of the main building, the cathedral is sometimes considered the highest Orthodox Church in the world. There is another Cathedral of Saints Peter and Paul Church in St. Petersburg, located in Petergof.
The current building, the first stone church in St. Petersburg, was designed by Trezzini and built between 1712 and 1733. Its golden spire reaches a height of 404 feet (123 m) and features at its top an angel holding a cross. This angel is one of the most important symbols of St. Petersburg. The cathedral's architecture also features a unique iconostasis (the screen which separates the nave of the church from the sanctuary). In the Eastern Orthodox Church the iconostasis is normally a flat wall or screen with three doors through it, the central Holy Doors used only for very solemn entrances, and the two side doors, by which the clergy and others enter and leave the sanctuary. However, at St. Peter and Paul, the iconostasis rises to form a sort of tower over the sanctuary. T