Römersteinbruch bei Andernach, Ancient stone quarry near Andernach, Germany.

Römersteinbruch bei Andernach is a basalt quarry on the Hohe Buche, a volcanic cone northwest of Andernach-Namedy on the left bank of the Rhine. Six Roman extraction areas have been identified, with pits surrounded by coarse dressing waste. The site also preserves traces of later medieval and modern quarrying, including four basalt blocks cut for the Trier bridge that were left in the Fornicher Ley.

Roman workers opened this quarry more than 2000 years ago, extracting basalt blocks for major building projects like the stone pier bridge at Trier. Work continued through medieval times, showing how long this stone source remained valuable.

The Roman quarry at the Hohen Buche is open to visitors and has information boards explaining the working steps in the ancient quarry, where basalt blocks and millstones were produced. Six Roman quarry areas have been identified, and four basalt blocks intended for the Trier bridge were found in the Fornicher Ley, never transported away.

The site is accessible via several marked hiking trails with information boards explaining historical extraction methods. These paths take visitors through different sections of the quarry, allowing views from various vantage points.

Four basalt blocks cut for the second-century stone pier bridge at Trier were found still lying in the Fornicher Ley, never shipped; the Roman quarries here appear to have served that single project, with an estimated 10,000 to 20,000 cubic metres extracted.