The Peter and Paul Fortress is a historic landmark in St. Petersburg, known for its iconic cathedral and rich history. The fortress was founded by Peter the Great in 1703 and served as a defensive structure during the city's early years. Today, it houses several museums, including the Peter and Paul Cathedral, which is the final resting place of many Russian emperors. Visitors can explore the fortress grounds, visit the museums, and enjoy panoramic views of the city from the fortress walls.