1) Volcano of Mars 
File:Tharsis Quadrangle map-la.svg|Map of the Tharsis quadrangle showing major features, several of which are tholi. Tharsis contains many volcanoes, including Olympus Mons, the tallest known volcano in the solar system. File:Ceraunius & Uranius tholi.jpg|2001 Mars Odyssey THEMIS mosaic of Ceraunius Tholus (lower volcano) and Uranius Tholus (upper...
round building; dome; cupola
A small domical mountain or hill.