Rif Fort was established at the western mouth of St. Anna Bay in 1828. The large citadel measures 315 by 98 feet and was constructed at the command of Dutch Lieutenant General Cornelius Krayenhoff. Baron Krayenhoff was an interesting historic figure. He was an expert in electricity dating back to the 1780s, he helped to map the Netherlands and he was the head of Dutch fortifications. After Riffort was decommissioned, it was as a waterworks, a prison and then a police headquarters. It is now a shopping mall and museum.