The cheeseburger at Shady Glen Dairy Stores in Manchester, Connecticut.
Four carefully arranged pieces of cheese extending far beyond the border of the patty melt directly on the grill, creating a chewy crust that is as difficult to describe as it is to digest. $4.95.

The original DB burger at DB Bistro Moderne in New York.
A sirloin burger filled with braised short ribs, foie gras, and black truffles. $32.

Denny's Beer Barrel Belly Buster at Denny's Beer Barrel Pub in Clearfield, Pennsylvania.
The world's biggest burger: 11 pounds of beef, 22 slices of cheese, three whole tomatoes, and a jar's worth of pickles. No one person has ever finished it. $49.95. [Previously discussed here.]

The Krispy Kreme burger at the Gateway Grizzlies ballpark concession stand in St. Louis.
A bacon cheeseburger with glazed doughnuts in place of a bun. A thousand-plus calories. Minor league gimmick; major league angina. $4.50.

The deep-fried hamburger at Dyer's Burgers in Memphis.
Instead of a grill, Dyer's uses a cast-iron skillet filled with grease. Old grease. They've been using the same batch since they opened — in 1912. $3.