Definitions for "Rotunda"
A round building; especially, one that is round both on the outside and inside, like the Pantheon at Rome. Less properly, but very commonly, used for a large round room; as, the rotunda of the Capitol at Washington.
a building or room circular in plan and usually domed
A round building; especially one covered by a dome.
The Rotunda is an iconic, cylindrical tower block in Birmingham, England.