The Mole Antonelliana (pronounced [ˈmɔːle antonelˈljaːna]) is a major landmark building in Turin, Italy, named after its architect, Alessandro Antonelli. A mole in Italian is a building of monumental proportions. Construction began in 1863, soon after Italian unification, and was completed in 1889, after the architect's death. Originally conceived of as a synagogue, it now houses the National Museum of Cinema, and is believed to be the tallest museum in the world. A representation of the building is featured on the obverse of the Italian 2 euro cent coin. Catalan vaults are featured in the ceiling of the ground floor under the atrium, which are relatively rare in Italy but popular in Spain, where they originated.