Rotunda
round room
Capitol records.
A building with a round roof, like the Capitol building in Washington DC or Saint Paul's cathedral in London.
Rondavel
Silo
A circular room in commercial buildings or out buildings is called a round house, in a private house it can be called among other things a turret. A rotunda is a round building or a room in a building, the central hall in the Capitol Building in Washington DC is an excellent example of a rotunda ( round room).
round pizza
Hearthome City, the round building.
The name of Alaska's capital building is called the Federal and territorial building.
A roof that overhangs its supporting wall could be called Eaves or a Gable, depending on which aspect of the building it is on. On the ends of a building it is called a Gable, whereas on the sides it is called the Eaves. "Eaves" also applies to buildings with no perceivable ends or sides; a round building for instance.
The name of the tallest building in the Basque Country is the Torre Iberdrola building.