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The dolmen is the largest megalithic monument in Catalonia, dating back to between 3,500 and 3,000 years BCE. Situated in the Casa Cremada area within the municipality of Roses, this megalithic structure is built on flat terrain but in an elevated area, at the edge of a slope that descends towards the Rec de la Quarantena on the west side. The dolmen takes its name from the farmhouse that surrounds it, known as Mas de la Creu d'en Cobertella. It is believed to be a trapezoidal chambered corridor tomb constructed from granite slabs, with an antechamber also made of granite slabs. Only the grooves for the placement of the slabs of the corridor remain, while there are no visible traces of the artificial circular mound that would have covered it or its surrounding upright stone circle. The entrance to the dolmen is oriented to the southeast. Internally, the chamber measures 3.90 m in length, 3.20 m in width, and has a maximum height of 2.45 m.
, a Neolithic settlement, reveals a glimpse into ancient urbanism and cabins. The site, spanning 800 m², showcases well-preserved remnants of sub-rectangular houses forming a 'U' shape, an isolated oval cabin, and traces of communal life. The oval cabin, measuring 10 x 7 m, likely served as a communal hub for cooking and essential activities. Archaeological phases, from the early to late Neolithic, reveal evolving structures and cultural artifacts. Nearby, the Serra de Rodes and Cap de Creus boast a concentration of dolmens, illuminating the region's megalithic heritage. Ca N'Isach offers a remarkable window into Neolithic life, with a rich history spanning millennia.