The two pit furnaces at Dunshammar, two kilometres south of Ängelsberg, constitute the oldest link in the 1,500 years during which iron has been produced in the region. The furnaces have been well preserved and the site is one of only a few where Iron-Age pit furnaces can be seen in their natural setting. Several other pit furnaces existed in the bays on the eastern shore of lake Åmänningen during the Iron Age. The people lived just back from the shore, and Iron-Age graves have been discovered near Västervåla church and at Virsbo, 8 km to the south.
The furnaces, made of stone and sealed with clay, were created in pits, and bellows were used to blow air into the furnace. The ore was brought up from the bottom of the lake using boats or rafts in the summer, and through holes made in the ice in winter. The ore from the bed of the lake was rich in iron, having a concentration of some 60%. However, it also contained phosphorus, which makes the iron hard and brittle. Once the iron had been brought up from the lake bed, it was roasted to remove the moisture and any organic material. When the bellows were operating, the temperature in the furnace reached about 1100°C. The slag ran down and settled out on the bottom of the furnace, while the iron solidified into a lump on top of the slag. Because of the relatively low temperature, the iron had a low carbon content and could be forged straight from the furnace. Most of the phosphorus was carried away in the slag.
Two archeological digs have taken place on the site, one in 1969–70, and the other in 1985. The age of the furnaces, determined by radiocarbon dating (C14), was found to be AD 300-800. An estimate was also made of the amount of iron produced over the centuries, and this turned out to be six or seven tonnes.
As well as the two well-preserved pit furnaces, there are also a charcoal-burning stack and three large slag heaps on the site. Around the furnaces are hollows that were created when clay was dug out for sealing the furnaces. The local heritage association at Västervåla has established a small museum in which the ancient process of producing iron is depicted in words and pictures.References:
The Porta Nigra (Latin for black gate) is the largest Roman city gate north of the Alps. It is designated as part of the Roman Monuments, Cathedral of St. Peter and Church of Our Lady in Trier UNESCO World Heritage Site. The name Porta Nigra originated in the Middle Ages due to the darkened colour of its stone; the original Roman name has not been preserved. Locals commonly refer to the Porta Nigra simply as Porta.
The Porta Nigra was built in grey sandstone between 186 and 200 AD. The original gate consisted of two four-storied towers, projecting as near semicircles on the outer side. A narrow courtyard separated the two gate openings on either side. For unknown reasons, however, the construction of the gate remained unfinished. For example, the stones at the northern (outer) side of the gate were never abraded, and the protruding stones would have made it impossible to install movable gates. Nonetheless, the gate was used for several centuries until the end of the Roman era in Trier.
In Roman times, the Porta Nigra was part of a system of four city gates, one of which stood at each side of the roughly rectangular Roman city. The Porta Nigra guarded the northern entry to the Roman city, while the Porta Alba (White Gate) was built in the east, the Porta Media (Middle Gate) in the south, and the Porta Inclyta (Famous Gate) in the west, next to the Roman bridge across the Moselle. The gates stood at the ends of the two main streets of the Roman Trier, one of which led north-south and the other east-west. Of these gates, only the Porta Nigra still exists today.
In the early Middle Ages the Roman city gates were no longer used for their original function and their stones were taken and reused for other buildings. Also iron and lead braces were broken out of the walls of the Porta Nigra for reuse. Traces of this destruction are still clearly visible on the north side of the gate.
After 1028, the Greek monk Simeon lived as a hermit in the ruins of the Porta Nigra. After his death (1035) and sanctification, the Simeonstift monastery was built next to the Porta Nigra to honor him. Saving it from further destruction, the Porta Nigra was transformed into a church: The inner court of the gate was roofed and intermediate ceilings were inserted. The two middle storeys of the former gate were converted into church naves: the upper storey being for the monks and the lower storey for the general public. The ground floor with the large gates was sealed, and a large outside staircase was constructed alongside the south side (the town side) of the gate, up to the lower storey of the church. A small staircase led further up to the upper storey. The church rooms were accessible through former windows of the western tower of the Porta Nigra that were enlarged to become entrance doors (still visible today). The top floor of the western tower was used as church tower, the eastern tower was leveled, and an apse added at its east side. An additional gate - the much smaller Simeon Gate - was built adjacent to the East side of the Porta Nigra and served as a city gate in medieval times.
In 1802 Napoleon Bonaparte dissolved the church in the Porta Nigra and the monastery beside it, along with the vast majority of Trier"s numerous churches and monasteries. On his visit to Trier in 1804, Napoleon ordered that the Porta Nigra be converted back to its Roman form. Only the apse was kept; but the eastern tower was not rebuilt to its original height. Local legend has it that Napoleon originally wanted to completely tear down the church, but locals convinced him that the church had actually been a Gaulish festival hall before being turned into a church. Another version of the story is that they told him about its Roman origins, persuading him to convert the gate back to its original form.
In 1986 the Porta Nigra was designated a World Heritage Site, along with other Roman monuments in Trier and its surroundings. The modern appearance of the Porta Nigra goes back almost unchanged to the reconstruction ordered by Napoleon. At the south side of the Porta Nigra, remains of Roman columns line the last 100 m of the street leading to the gate. Positioned where they had stood in Roman times, they give a slight impression of the aspect of the original Roman street that was lined with colonnades. The Porta Nigra, including the upper floors, is open to visitors.