Baptistery of Pisa
This is where people were baptized in medieval Pisa (PEE-za), in Italy. The people of Pisa built their round baptistery in the Romanesque style around 1150 AD. So the lower levels have round arches. But by the time they finished building the upper part, people were changing over to the Gothic style, and the upper windows were made with pointed arches.
Compare this baptistery to the baptistery in Florence, very close by, which was built just a little earlier.