Renaissance Sculpture is varied and very often executed on a grand scale. You can see (in person) some of the sculpture produced in the Renaissance and lots of it without having to pay an entrance fee to a museum or gallery.
There are several fine examples in Florence. (Michelangelo's David being one of these). St Peters in Rome has work by Bernini and Michelangelo, and the gilded bronze papal altar is a must see.
The square in front of the Palazzo Vecchio in Florence is known as the Piazza della Signoria. This and the surrounding area is packed with several excellent works and, best of all, you don't pay an admission fee to view them.
Some of the greatest early Renaissance Sculpture was created by the artists Donatello, Gilberti and Leonardo's master Verrocchio. Click on the link to view their work. Early Masterpieces
Giambologna. (Giovanni da Bologna)
Giovanni da Bologna became known simply as Giambologna (1529-1608). He was trained in Antwerp before moving to Rome to study the Ancients and the work of Michelangelo. He eventually settled in Florence and worked in the service of the Medici family he became one of the most important sculptors of the Late Renaissance.