Stefan Zweig of Vienna (1909); Paul Warburg from New York, son of the banker's family of Hamburg and co-founder of the US-Federal Reserve Bank (1910); the wife and son of Leon Sidelsky of Vladivostok, co-builder of the trans-Siberian railway (1913); Konrad Adenauer, then Lord Mayor of Cologne (1917); and many other famous names of politics, science, literature and art from Germany as well as the rest of the world. The health resort was expanded and in parallel with it St. Blasien's health resort became one of Europe's best-known medical institutes. Due to that, many famous people such as author Heinrich Mann (1892) and Russian revolutionary Maxim Gorki (1921) took the cure there. The latter visited St. Blasien based on a recommendation by Lenin who had stayed in Zürich before WWI. Because of its modern spa facilities, metropolitan flair, seclusion and romantic location in the Black Forest, St. Blasien was favored by the Grand Duke of Baden Frederick I (German: Friedrich I.) and his wife Luise. Between 1870 and 1906, they often stayed in the Friedrich-Luise-Ruhe building, which was named after them, during their curative stays. During that time, St. Blasien received its town charter and obtained the approval to complete the renovation on the domed church. In September 1918, Prince Max of Baden, the last Reich Chancellor of the German Empire, stayed in St. Blasien. Only weeks later he arbitrarily announced Wilhelm II’s abdication in Berlin. The first famous personalities to come to St. Blasien in the 19th century were liberal journalist and literary critic Ludwig Börne (1832), composer Felix Mendelssohn Bartholdy with his wife Cécile on their honeymoon in 1837, and Franklin Delano Roosevelt, later president of the U.S. Roosevelt visited St. Blasien each year until he turned 14 with his parents for hiking and cycling. In 1905 he spent a part of his honeymoon there as well. One of the last well-known people to come to St. Blasien was the world-famous opera singer Heinrich Schulnus with his wife in 1945 during the end of WWII. After the health resort was sold and the health resort St. Blasien AG was dissolved by Otto Hüglin and his son Albert Hüglin in 1925, the town's level of renown gradually decreased. Sons and daughters of the city Alfred Buntru (1887–1974), water engineer and rector of the RWTH Aachen University. Josef Glaser (1887–1969), national football (soccer) player. Busso Thoma (1899–1945) executed by the