Milan were built in the city during this period by the architects, Pellegrino Tibaldi, Galeazzo Alessi and Ricchino himself. Empress Maria Theresa of Austria was responsible for the significant renovations carried out in Milan during the 18th century. This profound urban and artistic renewal included the establishment of Teatro alla Scala, inaugurated in 1778 and today one of the world's most famous opera houses, and the renovation of the Royal Palace. The late 1700s Palazzo Belgioioso by Giuseppe Piermarini and Royal Villa of Milan by Leopoldo Pollack, later the official residence of Austrian viceroys, are often regarded among the best examples
Metropolitan Opera House (Philadelphia) renovation of the opera house in 2017-2018. The MOH has been included in the National Register of Historic Places since 1972. The Metropolitan Opera House was built by Hammerstein to be the home of his then new opera company, the Philadelphia Opera Company (POC). Hammerstein hired architect William H. McElfatrick of the firm J.B. McElfatrick & Son to design the opera house in 1907, and construction began the following year. When it opened as the Philadelphia Opera House in 1908, it was the largest theater of its kind in the world, seating more than 4,000 people. The opera house officially