Edtropolis

In the episode "Urban Ed" the Eds get tired of suburban living and decide to build a city of their own. The result is a carboard city called Edtropolis. It is a massive structure that spans most of the lane. It should be noted that the lane is quite thin and the city is far wider than the lane that holds it. The city has dozens upon dozens of skyscapers made of cardboard boxes. It is filled with hundreds of cardboard cut-out people.