Kresty (Russian: Кресты, literally Crosses) prison, officially Investigative Isolator No. 1 of the Administration of the Federal Service for the Execution of Punishments for the city of Saint Petersburg (Следственный Изолятор № 1 УФСИН по г. Санкт-Петербургу) is a detention center in Saint Petersburg, Russia. The prison consists of two cross-shaped buildings (hence the name) and Alexander Nevsky Cathedral.