These are vintage 20th century views of European cities. They were generally sold as decorative wall art or to tourists. The Eau Fort Originale stands for acid etched print. The indent in the paper around the image is called the plate mark. There is no attribution to a listed artist with the last name Hubert (some sellers claim Hubert Robert, however that is an 18th century French painter and incorrect). These sell for an average of $20 - $80 each.