There are actually 5 domes,...

There are actually 5 domes, but the latter 2 are only advised for more experienced climbers. This was taken while traversing to the last dome on the way to Durier hut and Aiguille de Bionnassay (the peak on the left) / Mt Blanc (hidden in weird clouds), also sometimes called the royal traverse. Beautiful, but sometimes hard.

(c) Harry Kikstra 7summits.com