Traces of settlement at the prehistoric Kakushöhle between Eiserfey and Weyer date back to 80,000 BC. Hunter-gatherer groups of the Neanderthals left behind numerous stone implements of the Middle Palaeolithic epochs and animal bones.
The old parish church of St. Cyriakus in Niedermenig is a Romanesque church from the 12th century. In the second half of the 15th century a Gothic chapel was added to the choir.