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When was the facade of San Carlo alle Quattro Fontane added?
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Francesco Borromini
Piazza Navona, Rome, with the church of Sant'Agnese in Agone, designed by Francesco Borromini, and (foreground) the Fountain of the Moor, originally designed by Giacomo della Porta and revised by Gian Lorenzo Bernini.
The tall facade of San Carlo alle Quattro Fontane was added to the church about 1677.1