Martin’s Wall Lookout Rock
The rocky viewpoint towers over the steep sides of Černá Nisa valley in Liberec-Kateřinky. In 2004 the Jizersko-ještědský horský spolek (Jizera and Ještěd Mountain Club) completely renovated the view-point and since then they have held there their Midsummer Festival in June. However, the place is accessible throughout the year and offers a great view into the valley.