The layout of the piazza today was designed in neoclassical style between 1811 and 1822 by the architect Giuseppe Valadier,[1] He removed a modest fountain by Giacomo Della Porta, erected in 1572,[2] and demolished some insignificant buildings and haphazard high screening walls to form two semicircles, reminiscent of Bernini's plan for St. Peter's Square, replacing the original cramped trapezoidal square centred on the Via Flaminia.