Situated amid the faux antiquity of the Forum Shops at Caesars Palace, the Martin Lawrence Galleries Las Vegas (www.martinlawrence.com) is a genuine bastion of modernity. The business specializes in masterpieces from the 20th and 21st centuries and showcases works by Pablo Picasso, Marc Chagall, Roy Lichtenstein, and the father of Art Deco, Erté. The Las Vegas gallery, which opened completely earlier this year, is the 11th Martin Lawrence establishment, and, at 26,000 square feet, it is the largest art gallery in the United States. Its holdings include a complete suite of Marilyn Monroe–themed works by Andy Warhol. The gallery’s viewing rooms are open to browsers and buyers alike.