What famous Renaissance structure building is Donato Bramante most noted for designing?

Donato Bramante is most noted for designing the Tempietto, a small temple located in Rome, which exemplifies the High Renaissance style. Commissioned by Ferdinand and Isabella of Spain, it was built to mark the traditional site of St. Peter's martyrdom. The structure features classical elements such as a circular plan, a domed roof, and harmonious proportions, influencing later Renaissance architecture, including the design of St. Peter's Basilica.