Within the Fortress works the oldest industrial enterprise in the city, which is only a few years younger than the city itself: The St. Petersburg Mint, founded by a decree of Peter the Great in 1724. In fact, it is one of the largest in the world and mints coins, medals, and orders of merit. Visitors to such a secure and important location are not permitted, but nearby in the St. Nicholas Wall of the fortress a company store is open where mint collectors and fans can purchase souvenirs.