Mellow Mushroom by Mark Almond.JPG

Mellow Mushroom has 15 locations across Alabama, including this one in Birmingham's Five Points South. (Mark Almond/malmond@al.com)

At Mellow Mushroom Pizza Bakers around the country, including 15 locations in Alabama, they're going to party like it's 1974 on Wednesday.

The Atlanta-based pizza chain is turning back the clock -- and some of the prices -- to celebrate its 40th anniversary with one-day-only "Way Back Wednesday" food and drink specials.

Cokes will be 30 cents; Michelob, Budweiser and Pabst Blue Ribbon beer 75 cents; and a small cheese pizza will set you back a whopping $2.50.

The first Mellow Mushroom opened on Spring Street in Atlanta in 1974.

Also, all throughout August, Mellow Mushroom is sponsoring a contest for a trip for two to Amsterdam. To enter, customers need to take a picture of themselves with the backdrop of the original Mellow Mushroom location at any of the participating restaurants and post it to Instagram with the hashtag #40YearsBaked. Those who don't have an Instagram account may upload their images here.

The first Mellow Mushroom

and the chain has grown to include more than 170 locations in 18 states.

In Alabama, Mellow Mushroom has restaurants in Auburn, Birmingham, Daphne, Decatur, Enterprise, Foley, Hoover, Huntsville, Mobile, Montgomery, Oxford, Prattville and Tuscaloosa.

For hours, phone numbers and directions, go here.