A Prospect of the New Aqueduct of Lisbon, as crossing over the Valley of Alcantra on Stone Arches, the Largest of which is… https://www.rawpixel.com/image/9205060/image-vintage-people-public-domainFree Image from public domain licenseBreath taking view of a cliff and the sea. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3298916/free-photo-image-portugal-azure-sky-batherFree Image from public domain licenseAqueduct, Lisbon, Portugal: panoramic view over the Valley of Alcantra. Coloured line engraving by T. Bowles after R. Black. https://www.rawpixel.com/image/13956318/image-cows-person-skyFree Image from public domain licenseAqueduct, Lisbon, Portugal: overlooking the Valley of Alcantra. Line engraving, 1751. https://www.rawpixel.com/image/14002655/image-paper-cloud-cartoonFree Image from public domain license