Henry Clay Frick made his fortune in the coke and steel industries at the turn of the 20th century. He was also an avid collector of European art. His 18th-century French-style mansion, built in 1914, remains one of the most beautiful buildings on Fifth Avenue and is also the home of the Frick Collection, considered one of the best small art museums in the United States. In his lifetime Frick amassed a superb collection of old masters and many of the paintings are still arranged according to Frick's design, (although additional works have been bought by the Frick over the years in line with the aesthetic of the existing collection). The best known pieces on display include Jean-Honore Fragonard’s masterpiece, The Progress of Love, as well as three Vermeers, including Mistress and Maid, and Piero della Francesca's St. John the Evangelist. The Frick’s most endearing quality is its intimacy; it’s pleasantly free of the stark, anonymous that characterizes some galleries and the interior still feels like a private home. It’s easy to see why, for many people, this is their favourite New York museum.