Interlaken's reputation as international resort started around 1800 due to the landscapes of Franz Niklaus König and other Swiss landscape artists. The success of the Unspunnenfest, a festival of Swiss culture, in 1805 and 1808 brought many tourists to Interlaken. Starting in 1820, they came for mountain air and spa treatment and the large Kursaal opened in 1859 to provide an elegant spa. The many hotels combined with good transportation links made it easy for these early tourists to visit. In 1835 a steam ship route opened along Lake Thun from Thun, followed in 1839 by another along Lake Brienz from Brienz.
