So-called Tallinn Gate is the only remaining 17th century gate of the city wall in Baltic Countries. It was built between 1675 and 1686 and designed probably by Swedish Erik Dahlberg. During the teardown of the fortification in the 19th century only the Tallinn Gate was preserved, as well as the embankments and the trench that leads to the Venuse Bastion at the riverside - the so called Vallikäär.
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.