Beyond speculations about whether the building was a mausoleum or a villa during the Roman era, the roman complex of Centcelles (Constantí) is unique for its 4th century mosaics. Exceptional architectural testament of the late-Roman period in Catalonia, since the year 2000, it has been included in the set of monuments of the ancient Tarraco which were declared a Unesco World Heritage Site.
The oldest remains of Centcelles are from a small rural building from the 2nd -1st Century BC, which later became a magnificent villa with a baths complex. The most notable area is the closed circular room with a dome where the mosaics are found. These are considered to be the oldest Christian-themed dome mosaics of the Roman world and are exceptional for their good state of preservation. They represent several scenes, organised into three areas: a hunt on the lower section, biblical scenes from the Old and the New Testament in the central part and figures of the four seasons at the top.
From the study of these mosaics and mural paintings, one could think that the villa was a mausoleum. Even so, its interpretation is still uncertain. The first hypothesis of the researchers suggested that the mosaics made reference to the tomb of Constant, son of the Emperor Constantine the Great. More recent researches, however, think that Centcelles was the late Roman villa of a notable person in the ecclesiastical or civil hierarchy.
With 42 painted figures and 260 other images carved into the rock, La Roca dels Moros del Cogul, in Les Garrigues, is one of the most outstanding and best-conserved rock-art sites in Catalonia. Amongst the most outstanding scenes depicted are a hunting scene and a phallic dance, an exceptional representation of a ritual event, which lends credence to the idea of the cave being a place for religious practices.
This area of Les Garrigues has been inhabited continuously by humans since the Paleolithic period and the cave was used for about 5000 years as a place of worship. The last hunter-gatherers (8th - 5th millennium BC) left behind paintings known as Levantine art. Later, from the 5th- 2nd millennium BC, Neolithic groups covered up the reliefs in the rock to draw representations of their own beliefs (diverse representations that fall within the classification of schematic art ). Researchers have also identified later inscriptions from the Iberian and Roman periods, though many are illegible.
El poder dels monjos de l’orde de Sant Bruno, establert a Escaladei des del segle XII, era tan important que van arribar a posar el nom de tot el comtat: el Priorat . De l’antiga esplendor només es conserven les ruïnes de la cartoixa Santa Maria d’Escaladei , la primera de les que es van construir després a tota la península Ibèrica.
El monestir d'Escaladei va ser fundat el 1163 per petició del rei Alfons I la casta, amb la intenció de colonitzar i cristianitzar la Nova Catalunya dels musulmans. El lloc escollit va ser la Vall d’Oliver, als peus de la serra del Montsant, on consta la llegenda que un pastor havia somiat amb els àngels que ascendien al cel per una escala: Escaladei, l’escala de Déu .
Al sòl rocós de la zona es va estendre el conreu de vinyes i olives per a l’oli , dos elements que van permetre la revitalització comercial de tota la regió. El moment de major esplendor va començar al segle XVI, quan va ser el focus de l’inici del renaixement a Catalunya i va durar fins al segle XVIII, aquests tres segles, el complex monàstic s’amplia fins a la seva configuració final.
Actualment, es conserven les estructures de l’antic complex cartoixà d’Escaladei, ara com una ruïna romàntica. La visita permet fer un recorregut exterior dels 3 claustres (un d’ells reconstruït), l’Església, el refectori i una cel·la reconstruïda. Són les restes de 600 anys d’història d’ un dels monestirs medievals i moderns més importants de Catalunya .