gardens was built around 1850 as a summer palace in moorish style for King Wilhelm I of Württemberg. It currently houses around 8000 animals and some 5000 plant species and contains the biggest magnolia grove in Europe. Other parks in Stuttgart include the historic Botanischer Garten der Universität Hohenheim and Landesarboretum Baden-Württemberg at Castle Hohenheim (which date back to 1776 and are still used to catalog and research plant species), Uhlandshöhe hill (between the city center, Bad Cannstatt and Frauenkopf, and home to Stuttgart observatory), the Weißenburgpark (a five-hectare park in the Bopser area of Stuttgart South which dates back to 1834 and is now home to a 'tea house' and the 'marble room' and offers a relaxing view across the city center), the Birkenkopf a Schuttberg (at the highest point in central Stuttgart, where many ruins were laid to commemorate the Second World War), and the Eichenhain park in Sillenbuch (declared a nature reserve in 1958 and home to 200 oak trees, many 300–400 years old). There are a number of natural and artificial lakes and ponds in Stuttgart. The largest is the Max-Eyth-See, which was created in 1935 by reclaiming a former quarry and is now an official nature reserve. It is surrounded by an expansive open area overlooked by vineyards on the banks of the river Neckar near [Mühlhausen]. There are expansive areas of woodland to the west and south west of Stuttgart which are popular with walkers, families, cyclists and ramblers. The most frequented lakes form a trio made up of the Bärensee, Neuer See and Pfaffensee. The lakes are also used for local water supplies. In the Feuersee area in the west of Stuttgart lies one of two 'Feuersee's (literally fire lakes), striking for its views of the Johanneskirche (St. Johns) church across the lake, surrounded by nearby houses and offices. The other Feuersee can be found in Vaihingen. Cemeteries in Stuttgart include: The Hoppenlaufriedhof in Central Stuttgart, the oldest remaining cemetery which dates back to 1626, an infirmary graveyard last used in 1951 The Waldfriedhof, the 1913 forest cemetery that is connected to Südheimer Platz by funicular railway The Pragfriedhof, with its Art Nouveau crematorium. Established in 1873 it was extended to include Jewish graves in 1874 and also now houses the Russian Orthodox Church of Alexander Nevsky The Uff-Kirchhof cemetery in Bad Cannstatt which stands at the crossroads of two ancient Roman roads