Salinae is an important archaeological site in Vigo: an interesting tour of the only preserved solar evaporation marine saltworks from the Roman Empire.
A suggestive staged space explains the creation and development of the Roman salt industry in Vigo and the utilisation of fishing resources. It is the recovery and museological presentation of a Roman site, an evaporation salt lake, in operation during 1st-3rd centuries AD, which was devoted to large-scale salt production. An interesting route to discover the history of the only solar evaporation sea salt pond conserved and presented as a museum from the whole Roman Empire.References:
The Petersberg Citadel is one of the largest extant early-modern citadels in Europe and covers the whole north-western part of the Erfurt city centre. It was built after 1665 on Petersberg hill and was in military use until 1963. It dates from a time when Erfurt was ruled by the Electors of Mainz and is a unique example of the European style of fortress construction. Beneath the citadel is an underground maze of passageways that can be visited on guided tours organised by Erfurt Tourist Office.
The citadel was originally built on the site of a medieval Benedictine Monastery and the earliest parts of the complex date from the 12th century. Erfurt has also been ruled by Sweden, Prussia, Napoleon, the German Empire, the Nazis, and post-World War II Soviet occupying forces, and it was part of the German Democratic Republic (East Germany). All of these regimes used Petersberg Citadel and had an influence on its development. The baroque fortress was in military use until 1963. Since German reunification in 1990, the citadel has undergone significant restoration and it is now open to the public as a historic site.