Saints Peter and Paul Cathedral, Saint Petersburg
Petrogradsky District, Russia · built 1712
The Peter and Paul Cathedral (Petropavlovskiy sobor) 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 Hare 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 second tallest Orthodox Church in the world. There is another Cathedral of Saints Peter and Paul Church in St. Petersburg, located in Petergof.
Church data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).