<prompt> Translate the following text to SwahiliThe caverns of the Grotte du Grand Roc, to the northwest of Les Eyzies, are a natural rather than a historical phenomenon, but well worth a visit for the weirdly shaped stalagmites and stalactites and the panorama of the V??zyre Valley.  <response>: Mapango ya Grotte du Grand Roc, kaskazini magharibi mwa Les Eystres, ni ya asili badala ya kihistoria, lakini yanafaa kutembelewa kwa stalagmites na stalactites zenye umbo la ajabu na panorama ya Bonde la Viseure. 