The Lonja de la Seda or Llotja de la Seda (Silk Exchange) is a late Valencian Gothic-style civil building in Valencia. It is a principal tourist attraction in the city and UNESCO World Heritage Site.
Built between 1482 and 1533, it is an exceptionally well-preserved example of a secular building in late Gothic style of outstanding artistic value. It bears eloquent witness to the role played in the Mediterranean and far beyond by the merchants of the Iberian Peninsula in the 15th and 16th centuries.
la Lonja is composed of three parts. The main hall, Sala de Contratación (The Trading Hall), is a large lavishly decorated space supported by gorgeous twisted columns. This was the financial centre of La Lonja, where the merchants work out contracts. The side-wing is named the Pavilion of the Consulate, and this was the seat of the Tribunal del Mar - the first marine merchant tribunal to ever be formed in Spain. The first two floors were the main function rooms, with the upper one hosting a richly decorated ceiling. These rooms are still maintained original furnishings. On occasion, the Tribunal would imprison merchants for debts in the central tower of La Lonja - the third part of the structure.
In addition to being a very representative example of medieval places of commerce, the building incorporates elements of the new architectonic language that developed in Europe at the end of the 15th century incorporating the most daring progress in the field of construction techniques (admirable twisted columns and vaults of remarkable complexity, all in freestone of the highest quality).
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.