Pizza Parlor in Metro DC
Ledo's is my favorite. Medium and large pizza are square and the sauce, crust (you can eat it and not throw it away, like many pizzas) and not-portion-controlled toppings are excellent (they do use canned mushrooms though). Pepperoni and salami slices are not wafer thin, but 2-3 mm chunks.
Original Ledos is on University Boulevard about a half mile west of the University of Maryland campus. There are Ledo franchises throughtout the Metro DC area.