The Peter and Paul Fortress

The Peter and Paul Fortress (Russian: Петропа́вловская кре́пость, Petropavlovskaya Krepost) is the original citadel of St. Petersburg, Russia, founded by Peter the Great in 1703 and built to Domenico Trezzini's designs from 1706-1740. In the early 20th century, it was still used as a prison by the tsarist government.