Free Walking Sightseeing Tour #4 in Zurich, Switzerland

Friesenberg Castle, also known as Friesenburg, is the ruin of a spur castle in Zurich, Switzerland, which was probably built around the year 1200. It was first mentioned in 1218 in a description of the goods of St. Peter's Church as a landmark. It stands on the steep eastern slope of the Uetliberg, high above the city.

Wikipedia: Burg Friesenberg (Zürich) (DE)

Uetliburg ruins is the ruin of a high castle at 873 m above sea level. M. in the southwestern area of the Uto Kulm summit plateau of the Zurich local mountain Uetliberg, in the area of the municipality of Stallikon.

Wikipedia: Burg Uetliburg (DE)

The Uetliberg is a mountain in the Swiss plateau, part of the Albis chain, rising to 870 m (2,850 ft). The mountain offers a panoramic view of the entire city of Zürich and the Lake of Zurich, and lies on the boundary between the city of Zürich and the municipalities of Stallikon and Uitikon. The summit, known as Uto Kulm, is in Stallikon.

Wikipedia: Uetliberg (EN)

The Uetliberg Observation Tower is a 72-metre-high steel truss tower on the Uetliberg, Zurich's local mountain. Geographically, the tower on the mountain top belongs to the municipality of Stallikon. The tower, which can be seen from afar, is the landmark of Zurich's local mountain and is one of the highest publicly accessible observation towers in Switzerland.

Wikipedia: Aussichtsturm Uetliberg (DE)

The Sellenbüren ruins are a ruined hilltop castle located near the village of Sellenbüren in the municipality of Stallikon, on the western flank of the Uetliberg. From its summit, the Uto Kulm, a sharp ridge stretches west into the Reppisch valley and widens in between to the Ofengüpf, the site of the former Sellenbüren Castle. The site was well suited as a location, as it was practically storm-free from three sides, the fourth side could be sealed off relatively easily by creating a neck ditch.

Wikipedia: Burg Sellenbüren (DE)