The Porta Nigra is a well-preserved Roman Ruin in the middle of Trier, Germany. It's well worth visiting, and I suggest you purchase the Trier Antique Card, which provides admission to this site and several other Roman and UNESCO sites in town
Chapters
0:00 Introduction
0:15 The Rome of the North
1:13 The Porta Nigra
1:31 Purchase The Antique Card for Admission to local sites
1:58 Entering The Porta Nigra
3:39 Saint Simeon's Cell
4:09 Heading to the Upper Church of The Porta Nigra
5:19 Diorama of Trier in Roman times
6:15 End Credits