Porticoes were covered column-lined galleries opening onto a bare space.
Porticoes could be an annex to a building or an independant construction
alongside a public square or a street. The portico of Eumenes (Stoa of Eumenes)
on this picture, linked the theatre of Dionysos to the Odeon of
Herodes Atticus (17
This portico was enormous when compared to the other ones.