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On the sign:
RÖMISCHE RIESENQUADERN VON DER BADEANLAGE DES LEGIONSLAGERS VINDOBONA . GEFUNDEN 1962 BEI ABBRUCH DES HAUSES STERNGASSE 5
The stones are a remnant of the bathing facilities of the Roman legion camp Vindobona, a camp that was in Vienna around the first century AD. The stones were discovered during the demolition of the house on Sterngasse 5