In this eclectic wealthy residence of bachelors, younger brother Henry Philip oversaw the gem collection (acquiring the Hope Diamond and the Hope Pearl), while cousin Henry busied himself with the banking business and the Louisiana Purchase, together with Barings. Thomas Hope did not "settle" in London, however. He took up his grand tour where he left off, and in 1795 he began his extensive tours of the Ottoman Empire which included visits to Turkey, Rhodes, Egypt, Syria, and Arabia. He stayed for about a year in Istanbul/Constantinople during which he produced some 350 drawings depicting the people and places he witnessed in the Ottoman Empire, a collection now to be found in the Benaki Museum, Athens.