The Tapir Valley is the oldest megalithic funerary monument north of the Tagus.
Serra
Tomar
Over almost three thousand years, about ninety bodies were buried there, which were accompanied by vases, axes, knives, arrows, shale plates and other objects in stone, ceramics, bone and wood. These objects can be seen at the Prehistory Center of the Polytechnic Institute of Tomar and at the Archeology Interpretation Center of Alto Ribatejo (CIAAR), in Vila Nova da Barquinha.
Source: http://www.cm-tomar.pt/