Mainz Cathedral, also known as St. Martin's Cathedral, is a prominent Romanesque church located in Mainz, Germany. Construction began in 975 AD under the direction of Archbishop Willigis, and the cathedral was completed in 1009. It features a mix of architectural styles, including Romanesque, Gothic, and Baroque elements, showcasing its long history. The cathedral is notable for its impressive twin towers and beautiful stained glass windows. It serves as the seat of the Archbishop of Mainz and is an important religious site in the region. The cathedral is also a key landmark in Mainz, attracting many visitors each year.