The Württemberg Mausoleum is a memorial standing on the peak of Württemberg Hill at the westernmost end of Schurwald woods overlooking the Neckar river. The memorial was built for Catherine Pavlovna of Russia (1788–1819), the second wife of William I of Württemberg (1781–1864). The remains of William I and his daughter Maria Friederike Charlotte of Württemberg (1816–1887) are also housed in the mausoleum.
The mausoleum was built after the death of Queen Catherine between 1820 and 1824 based on a design drafted by Giovanni Salucci. The location on the former site of Wirtemberg castle was chosen as the home of the House of Württemberg.
Between 1825 and 1899 the mausoleum was used as a Russian Orthodox Church place of worship. The memorial is still used to this day for a Russian Orthodox service every Pentecost.
References:The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.