François-Marius Granet (1775-1849), View of Rome from the Piazza Trinita dei Monti at Sunset. Brown wash, over traces of graphite, Réunion des Musées Nationaux.
John Singer Sargent, Palazzo Rezzonico, c. 1902-1904. Watercolor over pencil on paper, 50.8 x 32.4 cm. Private collection.
Michelangelo Buonarroti, Study for the Porta Pia, 1561. Chalk and ink on paper, 44.2 x 28.1 cm. Casa Buonarroti, Florence.
Maerten van Heemskerck, Rome, Old Saint Peter’s Basilica and the Vatican Palace, c. 1535. Brown pen on paper, 27.6 x 62.3 cm. Albertina, Vienna.
John Singer Sargent, San Cataldo, Palermo (also known as A Mosque, Cairo), c. 1897. Oil on canvas, 35.88 x 47.63 cm. Private collection.
Wendy Artin, Cinecittà, 2000. Watercolor on cotton Khadi paper, 40 x 18 cm.
Maja Wronska, Lecce, 2013. Watercolor on paper, 42 x 56 cm.
Elizabeth Ockwell, East Door of the Palais Garnier, 2006. Pencil, pen and ink and watercolor on laid paper, 19 x 26 inches.

Frank Duveneck (1848-1919, American) - "Grande Canal, Venezia"  1883,
Etching, 11 1/4 x 19 inches.

Francesco Guardi (Italian, 1712-1793)
A Capriccio with a Ruined Gothic Arch, 1770/89
Pen and brown ink with brush and brown wash, over traces of black chalk, on ivory laid paper;175x248 mm
Francesco Guardi though respected posthumously died a realtive unknown. He studied under the famous Venetian painter Canaletto. Guardi was a master of capricci a style popular in Venice that blends fantasy and reality. 
The composition of this drawing was used in a couple of his paintings.