To subvert grumpy monarchs, angry medieval youths scrawled condiment graffiti such as "Fran Tanner has plague" or "the king is a jerk" inside their sandwiches. Dig beneath lettuce to bring history to light with today's Groupon: for $6, you get $12 worth of sandwiches, soups, and more at Silver Mine Subs, with locations on West Gorham Street and on the Beltline Highway.

Silver Mine Subs swiftly serves cold and hot sandwiches, using a no grilling or frying approach that puts the spotlight on the fresh, crisp ingredients. Browse the menu in search of the Steam Engine, a warm hoagie stuffed with meatballs, marinara sauce, and provolone ($4.09 for a 5-inch), or the turkey-and-avocado-packed Caribou ($5.69 for an 8-inch). Those who like a culinary challenge can take on the Mother Lode, with layers of roast beef, turkey, ham, and salami ($9.69 for an 11-inch). Complement subs with a piping-hot cup of broccoli-cheese soup ($2.99) or a garden salad sprinkled with fat-free ranch dressing ($3.99).

To accommodate hungry moonbeams and University of Wisconsin students, Silver Mine Subs serves its subs until 3 a.m. every day of the week. The ever-wakeful staff is ever friendly and ever striving to make service convenient to customers, so let them lob into your hands the most delicious submarine sandwiches since prospectors struck white gold during the mayonnaise rush of 1854.