It launched the Arch Deluxe in 1996, and the product flopped. The burger, intended to appeal to more sophisticated and "adult," used a mustard-mayo Arch Sauce, which the brand appeared to bring ...

But one of McDonald's most expensive endeavors aimed at drawing in sophisticated diners was also one of its biggest flops: The famed Arch Deluxe burger. It's not like this burger wasn't special.

Well, you're half right. This burger uses three slices of white cheese and crispy onions with its own sauce. The Big Arch is currently being tested in international markets, including Canada.