The Madrid Opera building, viewed from the southwest from the Plaza de Oriente, opposite the Royal Palace.
Wiki teaches that:
"The groundbreaking of the Teatro Real was on 23 April 1818, under the reign of King Ferdinand VII,
and it was formally opened by his daughter Queen Isabella II on 19 November 1850.
It closed in 1925 due to damage to the building and reopened on 13 October 1966 as a symphonic music venue.
Beginning in 1991, it underwent major refurbishment and renovation works and finally reopened as an opera house on 11 October 1997
with a floor area of 78,210 square metres (841,800 sq ft) and a maximum capacity of 1,958 seats."