The "Tempietto," one of Bramante's most famous masterpieces, was erected in the early 16th century, most likely about 1502, and is known as the "Tempietto." This memorial monument, in the shape of a miniature temple, may be seen in the courtyard of Rome's San Pietro in Montorio church. It is thought that Bramante designed this piece of architecture to be used by priests during services when needed for prayer. Bramante also planned to build a large complex with a number of buildings arranged around an open space, but it was never completed. This is because on August 13, 1497, the young Leonardo da Vinci was hired by the Church authorities to design a new system of canals for Rome. The project would have required extensive research into hydrology and engineering science at the time, so it's not surprising that Bramante didn't follow through with it. However, the plans are still preserved in some detail in a manuscript called "The Universal Meaning of Human Beauty" (which isn't actually a painting but a set of drawings). There are many other projects that have been suggested as having been designed by Bramante, but none of them has been proven true yet. For example, some historians claim that he was responsible for designing the center court at the Vatican Palace, but this hasn't been confirmed by any evidence so it's just another project that he planned but never finished.