Porta Nigra
Germany
A 2nd-century Roman city gate, the largest surviving one north of the Alps. Its name, Black Gate, was given in the Middle Ages after its darkened stone; it is a UNESCO World Heritage Site.
Germany
A 2nd-century Roman city gate, the largest surviving one north of the Alps. Its name, Black Gate, was given in the Middle Ages after its darkened stone; it is a UNESCO World Heritage Site.