Much like the earth's crust, a pizza crust supports layers that are frequently dissected by picky archeologists rooting out fossilized mushrooms to display in the Smithsonian's Edible History Museum. Dig up delicious toppings with today’s Groupon: for $10, you get $20 worth of pizza and hoagies at Beto’s Pizza.

For more than 50 years, Beto’s Pizza has pampered Pittsburghers with a hearty menu of unconventionally prepared pizza alongside an array of hoagies. The pizzeria's signature pie-making process entails adding shredded provolone cheese and generous layers of toppings ($0.50 each) to every slice or cut ($1.25 each) after the dough and sauce have been baked. A full pizza contains 28 pizza rectangles ($34.11), each boasting an inimitable texture of hot crust and half-melted cheese that serves as an interactive alternative to tasteless geometry textbooks. For less saucy fare, patrons can try a steaming steak hoagie, capped by a layer of bubbling cheese ($5.39 for a half; $10.69 for a whole). A high-powered veggie telescope grants herbivores access to a planetary bowl of tossed salad, available with orbiting sides of fried cauliflower, mushrooms, and hot peppers ($3.89+).