The roman aqueduct can be visited
Roman Eifel aqueduct

The Roman Eifel Aqueduct, also known as the Roman Canal, was a structure of antiquity and one of the longest aqueducts in the entire Roman Empire. It supplied the Roman city of Colonia Claudia Ara Agrippinensium, modern-day Cologne, with spring water from the Eifel region.
History+
Built around 80 AD, the Eifel Aqueduct replaced an older, less efficient water supply system. The calcium-rich Eifel water was considered of high quality. The 95.4-kilometer-long aqueduct, which reached 130 kilometers with its feeder lines, transported up to 20,000 cubic meters of drinking water daily solely by gravity. It is assumed that the Roman army was responsible for its construction.
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This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 50.5123, 6.6082