In the 19th century Europeans began to take a greater interest in Africa; several European explorers travelled in the area of modern Niger, such as Mungo Park (in 1805–06), the Oudney-Denham-Clapperton expedition (1822–25), Heinrich Barth (1850–55; with James Richardson and Adolf Overweg), Friedrich Gerhard Rohlfs (1865–67), Gustav Nachtigal (1869–74) and Parfait-Louis Monteil (1890–92).