Bitihorn , a small mountain in the southernmost outskirts of Jotunheimen , Norway. In 1810 he was the first person to ascend Mount Gaustatoppen in Telemark , Norway. The Grossglockner was climbed in 1800, the Ortler in 1804, the Jungfrau in 1811, the Finsteraarhorn in 1812, and the Breithorn in 1813.