Question: The Gundestrup cauldron is a richly decorated silver vessel, thought to date as a European Iron Age culture named after the archaeological site of La Tène, on the north side of Lake Neuchâtel in which country?

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Zyndram's Hill: Zyndram’s Hill (pol.  Góra Zyndrama) - archaeological site located in southern Poland, in Maszkowice village, Łącko commune.  Prehistoric defensive settlement occupied in the Early Bronze Age (1750-1550 BC), in the Late Bronze and Early Iron Age (950-400 BC) and in the La Tène Period (200-50 BC).

Killycluggin Stone: The Killycluggin Stone is a decorated stone, which has been interpreted by some as the cult image of Crom Cruach.  It was found at Killycluggin, County Cavan, in 1921 (Site number 93, Killycluggin townland, “Archaeological Inventory of County Cavan”, Patrick O’Donovan, 1995, p. 19).  O'Kelly, however, refers to this image as Crom Dubh.  Roughly cone-shaped and covered in Iron Age La Tène designs , it was discovered broken in several pieces and partly buried close to a Bronze Age stone circle, inside which it probably once stood.  The site has several associations with St. Patrick.  Nearby is "Tobar Padraig" (St. Patrick's Well), and Kilnavert Church, which is said to have been founded by the saint.  Kilnavert was originally called "Fossa Slécht" or "Rath Slécht", from which the wider Magh Slécht area was named.

Chiemsee Cauldron: The Chiemsee Cauldron is a gold cauldron found at the bottom of Lake Chiemsee in Bavaria in 2001.  The cauldron is decorated with figures reminiscent of the style of the Gundestrup cauldron.  It has a diameter of 50 cm and a height of 30 cm, and is made from 10.5 kg (23.15 pounds) of 18 carat gold.

Samad al-Shan: Samad al-Shan (22°48'N; 58°09'E) is an archaeological site in the Sharqiyah province, Oman where Late Iron Age remains were first identified, hence the Samad Period or assemblage.  The site was discovered by archaeological surveyors from Harvard University (1971).  It is located 2 km east of the village of al-Maysar (since c. 1995 al-Moyassar).  The excavation of this site (1981-1982) by Burkhard Vogt, Gerd Weisgerber and Paul Yule, (1987-1998) of the German Mining Museum, Bochum and later University of Heidelberg documented some 260 graves which span the Bronze Age to Late Iron Age in the Sultanate of Oman.  Samad is the type-site for the non-writing Late Iron Age of Central Oman in south-eastern Arabia.  This cultural assemblage evidences protoscript in the form of characters scratched onto pottery vessels.  It is preceded by the Early Iron Age which differs in terms of pottery from that distributed in the neighbouring present-day United Arab Emirates.

British Iron Age: The British Iron Age is a conventional name used in the archaeology of Great Britain, referring to the prehistoric and protohistoric phases of the Iron Age culture of the main island and the smaller islands, typically excluding prehistoric Ireland, which had an independent Iron Age culture of its own.  The parallel phase of Irish archaeology is termed the Irish Iron Age.

Poland in Antiquity: Poland in Antiquity is characterized by peoples belonging to numerous archeological cultures living in and migrating through various parts of the territory that now constitutes Poland in an era that dates from about 400 BC to 450–500 AD.  These people are identified as Celtic, Germanic, Baltic and Thracian tribes.  Other groups, difficult to identify, were most likely also present, as ethnic composition of archeological cultures is often poorly recognized.  While lacking use of a written language to any appreciable degree, many of them developed relatively advanced material culture and social organization, as evidenced by the archeological record, for example judged by the presence of richly furnished, dynastic "princely" graves.  Characteristic of the period was high geographical migration rate of large groups of people, even equivalents of today's nations.  This article covers the continuation of the Iron Age (see Bronze and Iron Age Poland), the La Tène and Roman influence and Migration periods.  La Tène period is subdivided into La Tène A, 450 to 400 BC; La Tène B, 400 to 250 BC; La Tène C, 250 to 150 BC; La Tène D, 150 to 0 BC.  400 to 200 BC is also considered the early pre-Roman period and 200 to 0 BC the younger pre-Roman period (A).  It was followed by the period of Roman influence, of which the early stage had lasted from 0 to 150 AD (0–80 B, 80–150 B), and the late stage from 150 to 375 AD (150–250 C, 250–300 C, 300–375 C).  375 to 500 AD constituted the (pre-Slavic) Migration Period (D and E).

Gundestrup cauldron: The Gundestrup cauldron is a richly decorated silver vessel, thought to date from between 200 BC and 300 AD, or more narrowly between 150 BC and 1 BC.  This places it within the late La Tène period or early Roman Iron Age.  The cauldron is the largest known example of European Iron Age silver work (diameter: 69 cm ; height: 42 cm ).  It was found dismantled, with the other pieces stacked inside the base, in 1891 in a peat bog near the hamlet of Gundestrup in the Aars parish of Himmerland, Denmark ( ).  It is now usually on display in the National Museum of Denmark in Copenhagen, with replicas at other museums; during 2015-16 it was in the UK on a travelling exhibition called "The Celts".

Torrs Pony-cap and Horns: The Torrs Horns and Torrs Pony-cap (once together known as the Torrs Chamfrein) are Iron Age bronze pieces now in the National Museum of Scotland, which were found together, but whose relationship is one of many questions about these "famous and controversial" objects that continue to be debated by scholars.  Most scholars agree that horns were added to the pony-cap at a later date, but whether they were originally made for this purpose is unclear; one theory sees them as mounts for drinking-horns, either totally or initially unconnected to the cap.  The three pieces are decorated in a late stage of La Tène style, as Iron Age Celtic art is called by archaeologists.  The dates ascribed to the elements vary, but are typically around 200 BC; it is generally agreed that the horns are somewhat later than the cap, and in a rather different style.

La Tène culture: The La Tène culture ( ; ] ) was a European Iron Age culture named after the archaeological site of La Tène on the north side of Lake Neuchâtel in Switzerland, where thousands of objects had been deposited in the lake, as was discovered after the water level dropped in 1857.

Nordic Bronze Age: The Nordic Bronze Age (also Northern Bronze Age, or Scandinavian Bronze Age) is a period of Scandinavian prehistory from c. 1700–500 BC.  The Bronze Age culture of this era succeeded the Nordic Stone Age culture (Late Neolithic) and was followed by the Pre-Roman Iron Age.  The archaeological legacy of the Nordic Bronze Age culture is rich, but the ethnic and linguistic affinities of it are unknown, in the absence of written sources.  Some scholars also include sites in what is now Estonia, northern Germany and Pomerania, as part of its cultural sphere.

Supporting paragraphs: Gundestrup cauldron La Tène culture
Answer: Switzerland