Paul Klunzinger was born on 26 May 1828 in Güglingen as the son of Karl Klunzinger (1799-1861) and Sophie Koch (1808-1847). After attending the Polytechnic School in Stuttgart (1842-1848/49), he emigrated via Italy to Austria, where from January 1850 he worked as an engineer for railway constructions in various projects. In the 1880s, Paul Klunzinger increasingly turned to hydraulic engineering and, in this context, participated in the preparation of expert reports and expert opinions. Among the projects in which he participated as an engineer or expert are the Klagenfurt - Villach railway line, the Raab - Budapest railway line and a project on the curvature of the Vienna River. The children Henriette (*1854), Paul (Pál) (* 1858), Helene (*1860), Richard (*1865), Walther (* 1868) and Otto (*1872) are descended from the marriage with Anna Mauch (wedding in the year 1854). Paul followed in his father's footsteps and became an architect; Richard became a doctor in Steyr. Her uncle, Paul's younger brother Karl Benjamin Klunzinger (1834-1914), made a name for himself as a doctor and zoologist. Before he became Professor of Zoology, Anthropology and Hygiene at the Polytechnic in Stuttgart in 1884, he had spent several years as a doctor in the Egyptian town of Al-Qusair (Koseir). Like his brother and his children, he always remained attached to his homeland. The family archive Klunzinger/Koch/Mauch was transferred by Dr. Anton Schimatzek from Vienna to the main state archive Stuttgart in 1988. Contents and evaluation Paul Klunzinger and his professional activity as a railway engineer and expert in questions of hydraulic engineering are at the centre of the tradition. In addition to private documents on him and his family, the collection also contains sketches and calculations from various construction projects, including the curvature of the Vienna River and the design of the Vienna Danube Canal. The private documents consist of letters, poems, drawings, family memories and genealogical documents such as family trees and "ancestor passports". They span several generations and provide insights into the family cohesion of a family originally from Swabia who succeeded in the Habsburg Monarchy in the 19th and 20th centuries, and they reflect the political, social and cultural moods of their time. Documents on the activities of Paul Klunzinger, who became a municipal architect in Budapest and was involved in the planning of the Erzsébet-kilátó (Elisabeth Lookout Tower), are kept in the Budapest Föváros Levéltára archive.