1) Monopteron 
A monopteros (Ancient Greek:ὁ μονόπτερος from the Polytonic: μόνος, only, single, alone, and τὸ πτερόν, wing) is a circular colonnade supporting a roof but without any walls. Unlike a tholos (in its wider sense as a circular building), it does not have a cella. In Greek and especially Roman antiquity the term could also b...
monopteron.