Monte Altissimo, Mountain summit in Seravezza, Italy.

Monte Altissimo is a mountain in the Alpi Apuane, in the municipality of Seravezza, reaching 1589 metres. It lies in the central part of the chain, slightly southwest of the main watershed. Its southern side drops almost vertically for over 700 metres, while the northern slopes are less steep and covered with beech woods.

Michelangelo turned to Monte Altissimo in 1517, using the particularly white marble of the Falcovaia quarry to try to obtain blocks for the facade of San Lorenzo in Florence. Quarrying later removed an entire summit cusp, and the site became a symbol of the No Cav movement. Trenches of the Gothic Line and old lizze, roads for sliding marble blocks downhill, remain on the slopes.

The mountain's marble has been quarried since at least 1517, when Michelangelo Buonarroti used the Falcovaia (or Cappella) quarry for its particularly white stone, aiming to extract blocks for the facade of San Lorenzo in Florence. That quarry, still active, removed an entire summit cusp and became a symbol of the No Cav movement seeking to close the quarries. Gabriele D'Annunzio compared the peak to the Nike of ancient Greece.

Routes to the summit start from Le Gobbie, where a marble road leads to the Fondone quarry; from there a stepped path climbs to Passo del Vaso Tondo and along the south-east ridge to the top. Another approach follows the Turrite valley past Isola Santa and Arni to the Passo degli Uncini ridge at 1380 m. Since 2014 the CAI Pisa trail no. 32 (EEA) climbs from La Polla at 587 m.

The summit view takes in the whole Apuane chain, the Versilia coast, the sea, the Tuscan Archipelago and Corsica. The mountain also carries Gotica Line trenches along its slopes and old lizze, stone chutes used to slide marble blocks downhill.