The Ivan the Great Bell Tower is a church tower inside the Moscow Kremlin complex. With a total height of 81 metres (266 ft), it is the tallest tower and structure of the Kremlin. It was built in 1508 on Cathedral Square for the three Russian Orthodox cathedrals, namely the Assumption, the Archangel and the Annunciation, which do not have their own belfries. It serves as a part of Moscow Kremlin Museums.

The Peter and Paul Cathedral 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 highest Orthodox Church in the world. There is another Cathedral of Saints Peter and Paul Church in St. Petersburg, located in Petergof.