LAS VEGAS ( MainStreet) -- In anticipation of May's National Burger Month, TravelsinTaste searched from West Coast to East for the best and most interesting burgers around the country.

In Las Vegas, where everything is over the top, Holsteins at The Cosmopolitan of Las Vegas is serving the Gold Standard, a dry aged beef sirloin burger with smoked bacon, aged goat cheddar cheese, tomato confit, baby arugula and garlic-chive aioli. Want something a little more decadent? They've got the Billionaire Burger with Kobe beef, foie gras, port onion marmalade, frisee and truffle mayo.

For the ultimate decadence, though, one must go to Fleur by Hubert Keller in Mandalay Bay, where Hubert Keller has perfected his FleurBurger 5000. The creation consists of a foie gras and black truffle-stuffed Kobe burger served on a brioche truffle bun with Keller's special sauce, and accompaniments include a bottle of Chateau Petrus 1995 poured in your very own Ichendorf Brunello stemware, imported from Sweden. By the way, the "5,000" in the name is not just a random number -- it's also the price. But of course the staff shipping your stemware home for you as a keepsake is included.

Taking it down a notch, you've got some other interesting options on the Strip, such as the "father of the mini burger" -- chef Sammy DeMarco's Original Mini Burgers at First Food and Bar in the Palazzo. Made up of four all-beef patties, special sauce, lettuce, cheese, pickles, onions and tomatoes, it must sound familiar. He even dubs his sauce a "Burger King type sauce for adults" and includes all the things you would normally find in a steak tartare, such as cornichon, capers and mustard.
The Billionaire Burger at Holstein's at The Cosmopolitan of Las Vegas is made with Kobe beef, foie gras, port onion marmalade, frisee and truffle mayo.

Looking for a little more heat? Susan Feniger and Mary Sue Milliken's Border Grill in Mandalay Bay serves a chile relleno burger of ground black angus brisket, roasted poblano stuffed with manchego, panela and cotija cheeses, brioche bun, chipotle aioli, tomato and shredded romaine served with cumin fries. It's sure to satisfy anyone's taste buds for an over-the-top experience.

The venerable P.J. Clarke's has entertained the famous, infamous and saloon aficionados of New York for 125 years. Its Cadillac Burger, mastered by chef Michael DeFonzo, got its name from jazz artist Nat King Cole, who proclaimed in the late 1950s that P.J. Clarke's made "the Cadillac of burgers!" out of a beef patty, lettuce, tomato, smoked country bacon and American cheese.

In West Hollywood, Comme Ca recently launched a burger night program in which guests can choose from specialty burgers, including a Lamb Merguez Burger, with lamb sausage, roasted peppers and caramelized onions, arugula on a ciabatta bun with french fries and harissa aioli; the Breakfast Burger, with housemade pork sausage,a sunny-side-up egg and white gravy on an English muffin, with Lyonnaise potato; the Comme Ca Veggie Burger, with cashew and pine nuts, garbanzo bean, ajuwan-tomato jam on a tofu bun with baby kale and spinach salad; and, of course, the classic Comme Ca Burger with Vermont cheddar and pommes frites.

Wolfgang Puck at the Hotel Bel-Air, meanwhile, showcases modern California cuisine with European and Mediterranean influences. Here you can be sure Wolfgang's Mesquite Grilled Black Angus Beef Burger with aged Vermont cheddar, shallot-jalapeno marmalade and garlic aioli is a healthy burger that is sure to satisfy.

In San Francisco, Tony's Pizza Napoletana features two unusual takes on the burger: the Burrata Burger with Niman ranch beef, smoked pancetta, caramelized onions, burrata, arugula and balsamic reduction on an Acme bun; and the Fig and Gorgonzola Burger with Niman ranch beef, pesto mayo, gorgonzola, fig preserve, frisee, caramelized fried onions and Acme bun.