The Ribeira Palace had existed here before its destruction in the 1755 Lisbon earthquake. The palace stood on one edge of the square for almost 250 years. Traditional painted buildings line the three sides of the square and one side (to the south) opens to the River Tagus.
Two large towers are situated on the each corner of the square. A sandy beach on the northern banks of the River Tagus (south of the square). The beachfront seems to be very popular not only with the tourists but also with the bird.
Cais das Colunas is a spot where Praca do Comercio meets the River Tagus. It is a perfect spot to enjoy the beauty of Lisbon. A staircase leads to the waterfront from Cais das Colunas. This is the place where people, birds, water, land and history meet together in full colours.