The Porta Nigra. Usually sightseeing of Trier starts with the main of the sights – the Porta Nigra, which in Latin means 'the black gates'. The Porta NIgra is the northern gates that were built in 180 AD and served as a part of the city wall. The wall is 6,5 km long, 3 m thick and 7,5 m tall. Their name the gates got later, when the sandstone, which used the Romans used,...
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