Most of the museum's collection was formerly housed at the Wallraf-Richartz Museum in Cologne until 1946. In the front of the museum the former northern town gate of Cologne with the inscription CCAA.

The Roman-Germanic Museum is a museum located in Cologne, Germany, dedicated to the cultural history of the Roman provinces of Germania Inferior and Germania Superior. Established in 1890, it houses a large collection of archaeological artifacts from the Roman and Germanic periods which includes sculptures and coins. The museum also contains the remains of the oldest Roman settlement north of the Alps, and the only surviving Roman city gate in Germany. It is one of the oldest museums in Germany and a major center for research in the field of Roman and Germanic history and archaeology.

The museum is organized into four sections: archaeology, numismatics, art and architecture. The archaeological section contains artifacts from the Roman provinces of Germania Inferior and Germania Superior, including stone monuments, pottery, jewelry, and tools. The numismatic section features coins from the time of the Roman Empire, as well as coins from the Germanic period. The art and architecture section contains sculptures and other artwork from the Roman and Germanic periods, as well as architectural fragments from the Roman city gate. The museum also contains a library and archive, which houses a large collection of books and documents related to Roman and Germanic history and archaeology.