The dolmen of Cova d'en Daina (Daina’s Cave) in Romanya de la Selva, is one of the most complete and best preserved megaliths in Catalonia. It is also noted for being one of the most representative funeral monuments of its type, known as a "Catalan gallery" or "wide corridor" grave.

Dating from between 2700 - 2200 BCE, in the Neolithic period, it consists of a covered gallery, 7 metres in length, in a U-shape, built with granite slabs. Originally, it would have incorporated a circular tumulus and cromlech (a structure formed by stones or menhirs affixed in the ground in a circular or elliptical shape).

These types of "Catalan gallery" tombs are typical of the late Neolithic period and are the result of the evolution of the "corridor graves". They are formed by a geometric chamber where the human remains and grave goods were deposited and a corridor almost the same width as the chamber.

The Cova d'en Daina was excavated for the first time in the nineteenth century and a large number of very fragmented bones and the teeth of many adults and children were found, the result of successive collective burials. In addition, flint tools, pottery fragments and some ornaments (necklaces and small pieces of slate and gold) were discovered.