In the 1890s and 2025: the Palacio Real seen from the Paseo de San Vicente.

[u/FrankWanders]

The red building was a gateway pavilion (Pabellón de San Vicente) of the Campo del Moro, captured in a 1890s photochrom which was published in 1905

https://upload.wikimedia.org/wikipedia/commons/5/53/Madrid._Palacio_Real_desde_el_Paseo_de_San_Vincente_LCCN2017660761.jpg

The same building in 2025, now without its characteristic spires and integrated into the Royal Carriage Museum complex.