sentences:  The class consists of several series (subclasses) of sister ships, most of which were built by Fincantieri in Monfalcone and Trieste, northern Italy.The first vessel of the original "Grand" class, , entered service in 1998.Ships of the later subclasses are based on the "Grand" class, but have modifications such as additional decks and varied placement of facilities such as the nightclub and restaurants.