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plan·e·tar·i·um /ˌplaniˈte(ə)rēəm/ Noun: 1: A domed building in which images of stars, planets, and constellations are projected for public entertainment or education. 2: A device used to project such images. This is the definition of "planetarium". The reason why they are important is because they are used to teach the public about astronomy. Planetariums are also used for entertainment purposes.
It is called the Domed Rotunda
Rotundarotunda
rotunda
Astrodome in Houston Texas
its domed roof was partially modeled on classical roman building
Taj Mahal
Domed building rotunda
A building with a round roof, like the Capitol building in Washington DC or Saint Paul's cathedral in London.
Rotunda
temple?
Possibly the Beehive House at 67 East South Temple in Salt Lake City. The Beehive House itself is not a circular stone building though, nor does it have a domed roof. It is a rectangle - there is just a beehive on the roof. There is a circular stone building with a domed roof nearby, the Salt Lake Tabernacle. However the tabernacle was never a residence, it has always been used as a concert hall and meeting place. Check out the photos under "Related Links" below to see images of these buildings. None of Brigham Young's residences were in circular buildings.