Florence's cathedral stands tall over the city. The church of Santa Maria del Fiore, the cathedral or duomo, of Florence is a vast Gothic structure built on the site of the 7th century church of Santa Reparata, the remains of which can be seen in the crypt. The cathedral was begun at the end of the 13th century in the Gothic style by Arnolfo di Cambio, and the dome, which dominates the exterior, was added in the 15th century. The church was then consecrated and "completed" although the façade was only half finished (it was redone and completed in the 19th century). The exterior is covered in a decorative mix of pink, white and green marble. The interior, by contrast, is pretty stark and plain. Inside, the clock above the entrance was designed in 1443 by Paolo Uccello in accordance with the ora italica, where the 24th hour of the day ended at sunset.