Cardiff, Wales developed as a major coal port due to its flat geography and proximity to coal fields in south Wales valleys. It began as a Roman fort built in 75 CE. Today, Cardiff is a principal finance center and one of the fastest growing economies in Europe. It has a strong education system including Cardiff University and 86 primary schools. Major tourist attractions include Cardiff Castle and the open-air National History Museum at St. Fagans. The city holds annual music and cultural festivals attracting hundreds of thousands of visitors.