Crystal palace in Madrid, Spain https://www.rawpixel.com/image/937680/interior-crystal-palaceView licenseThe Royal Palace of Madrid https://www.rawpixel.com/image/11925075/the-royal-palace-madridView licenseThe statue of Pedro in Saint Anne Square in Madrid, Spain https://www.rawpixel.com/image/937679/spain-famous-landmarkView licenseThe central part of the roman aqueduct image element https://www.rawpixel.com/image/9245601/image-border-arch-brickView licenseHospital Real, Santiago de Compostela: general view. Photograph, ca.1900. https://www.rawpixel.com/image/14002364/hospital-real-santiago-compostela-general-view-photograph-ca1900Free Image from public domain licenseA communication antenna tower at Sant Jeroni, the highest point in Montserrat, Catalonia, Spain https://www.rawpixel.com/image/5974651/photo-image-nature-mountains-skyFree Image from public domain licenseHospital Real, Santiago de Compostela. Photograph, ca.1900. https://www.rawpixel.com/image/14010167/hospital-real-santiago-compostela-photograph-ca1900Free Image from public domain licenseArches of a Roman aqueduct, Segovia, Spain. Photograph by Foto Aida, 1910/1936. https://www.rawpixel.com/image/13977638/arches-roman-aqueduct-segovia-spain-photograph-foto-aida-19101936Free Image from public domain licenseHospital de la Santa Cruz, Barcelona: the doorway of the hospital church with a statue of Charity above it. Photograph. https://www.rawpixel.com/image/13994788/photo-image-person-church-hospitalsFree Image from public domain licenseRoman aqueduct, Merida, near Badajoz, Spain. Photograph Foto Aida, 1910/1936. https://www.rawpixel.com/image/14016973/roman-aqueduct-merida-near-badajoz-spain-photograph-foto-aida-19101936Free Image from public domain license