The Old Gate (Altpoertel) is the medieval west city gate of Speyer, and is one of the original 68 towers in the old walls and gates. Today it is one of the largest and most architecturally significant of the remaining city gates in Germany.
The Old Gate was built between 1230 and 1250 on the ruins of a previous tower. The bottom of the 13th century tower remains as the foundation but, in 1511, Speyer's mayor ordered that the tower be rebuilt, so the top portion is newer. It was completed in 1514. It was originally built as an exterior gate, connecting the old town with the suburb of St.Gilgenvorstadt. A 20 metres high roof was added in 1708.
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.