This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Trier Treves Porta Nigra Black Gate Moselle valley of GermanyLCCN. accession number LCCN credit line LOCimage ppmsca photomechanical print photochrom color exhibition history Title from the Detroit Publishing Co catalogue Jforeign section Detroit Mich Detroit Photographic Company br part of Views of Germany in the Photochrom print