Both the steps and the Piazza got their name from the Spanish Embassy which I believe is located in the piazza. If you come here in the summer the stairs are divided by rows of flowers. The beautiful church of Trinita dei Monti lies at the top of the stairs. At the bottom of the stairs is the Fontana della Barcaccia (Fountain of the old boat) by Pietro Bernini. This place is a gathering spot for tourists, with people sitting on the steps and watching the other (tourists :-) ) go by. (from: http://andreea.francu.com/travel/rome.vr/places.vr/).