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The swimming complex from the Roman Late Antiquity is located in the heart of Trier.
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A total of four areas were planned: a warm water bath, a cold water bath, a warm air bath and a sports and gymnastics area.
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It is a UNESCO World Heritage Site and has been a listed building since 1989.
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Construction began before the year 300 AD, but the so-called Imperial Baths were never completed.
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After the Roman Emperor Constantine left Trier in 326, the construction work was completely halted.
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Later, the thermal baths were converted into cavalry barracks.
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After the Franks came to power, the complex was further rebuilt or newly built.
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It was also integrated into the Trier city wall as a corner fortress.
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When Napoleon seized power, he had some of the alterations removed and ordered the exposure of the original walls.
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At the beginning of the 20th century the first examination of the walls began.
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Even though very little has survived on the surface, there are still secret underground passages that were created for the servants at that time.
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Today the complex can be visited as an archaeological park.