Zuccari Palace

Palazzo Zuccari, also called Palazzetto Zuccheri, is a 16th-century residence, located at the crossroads of via Sistina and via Gregoriana, with a Mannerist 16th-century facades on the latter street and a late Baroque facade on the piazza Trinità dei Monti in the Campo Marzio neighborhood of Rome, Italy. Designed by Federico Zuccari, the house is known locally as the "House of Monsters" for the decorations on its doors and windows overlooking the via Gregoriana.

Source: Wikipedia