The cathedral, topped by Brunelleschi's dome, dominates the Florentine skyline. The Florentines decided to start building it – late in the 13th century, without a design for the dome. The project proposed by Brunelleschi in the 14th century was the largest ever built at the time, and the first major dome built in Europe since the two great domes of Roman times – the Pantheon in Rome, and Hagia Sophia in Constantinople. The dome of Santa Maria del Fiore remains the largest brick construction of its kind in the world. In front of it is the medieval Baptistery. The two buildings incorporate in their decoration the transition from the Middle Ages to the Renaissance. In recent years, most of the important works of art from the two buildings – and from the nearby Giotto's Campanile, have been removed and replaced by copies. The originals are now housed in the Museum dell'Opera del Duomo, just to the east of the cathedral.