There’s something about the simplicity and deliciousness of a burger that has made it a prominent menu staple for years. For many, the traditional cheeseburger is not enough. Restaurants all over the United States have upped the ante with specialty burgers that push the limits and the definition of the burger itself. Browse through six different burgers that bring on the flavors, food challenges, and savory flavors that must be tried.

Double Bypass Burger – Atlanta, GA

Don’t let the giant skeleton entryway scare you away from the iconic Vortex restaurant in Atlanta, Georgia. Once inside, skip right over all their insane menu options and order the Double Bypass Burger. This aptly named sandwich is loaded with two beef patties, eight strips of crispy bacon, two fried eggs, and is sandwiched between two grilled cheese sandwiches that are used for buns. Lettuce, tomato, and mayo can also be stuffed in the creation.

The 666 Burger – Evanston, IL

It may look like an ugly mess, but the flavors more than make up for this delicious combination only the devil himself could have created. Numbers are a factor in the burger that includes six slices of American cheese, six mozzarella sticks, and six slices of bacon. A traditional sesame seed bun tops the burger off.

The Original db Burger – New York, NY

If you’re looking to splurge on a gourmet specialty burger, then the Original db burger is one of your best bets. The patty is the real treat here, as you indulge on a sirloin burger that has been stuffed with braised short ribs in the middle. Topped with a black truffle Parmesan bun, each bite is filled with juicy flavor and one of the best burgers you’ll ever have.

The Early Riser – Memphis, TN

With a breakfast theme in mind, you can order this burger at any time of the day and eliminate any guilt you have. The Early riser replaces traditional hamburger buns with a pair of fluffy waffles. Two fried eggs also surround the burger, and each bite gets better as the yolk oozes down and gets soaked up in the waffles.

Eli’s Donut Burger – National

Food trucks all over the country feature the signature burger that must be bought if you spot it in public. Eli’s Donut Burger doesn’t have any surprises or deception. A glazed donut is sliced in half, light grilled and used as a delicious bun when served over a freshly made beef patty. The surprising mix of cheese and glaze creates a flavor explosion in your mouth.

ICOB Oyster Burger – Boston, MA

Leave it up to the inventive chefs in Boston, Massachusetts to perfectly create a mix of seafood and burger all in one. Fried oysters sit on top of a beef patty along with strips of bacon, pickled onions, and a special horseradish mayo that gives the sandwich a nice kick.

Keep these burgers in mind as you make your travels around the United States. Each one will give you food memories that you talk about for years to come.