The Caixa de Rotllan (meaning 'Roland's Tomb' in Catalan language) is a dolmen dating back to the Neolithic period, during the second half of 3rd millennium BC.
A legend holds that Roland lived in Vallespir and that, after his death at the Battle of Roncevaux Pass, his horse Veillantif carried Roland's corpse back to Vallespir and buried him under this dolmen. Dolmens are actually tombs, but they were erected many centuries before the legendary knight's adventures.
The Caixa de Rotllan is made of three upright stones making a H-shape, supporting a thick roofing stone and delimiting a rectangular, medium-sized chamber.
References:The Temple of Edfu is one of the best preserved ancient shrines in Egypt. It was built in the Ptolemaic Kingdom between 237 and 57 BC.
Edfu was one of several temples built during the Ptolemaic Kingdom, including the Dendera Temple complex, Esna, the Temple of Kom Ombo, and Philae. Its size reflects the relative prosperity of the time. The present temple initially consisted of a pillared hall, two transverse halls, and a barque sanctuary surrounded by chapels. The building was started during the reign of Ptolemy III Euergetes and completed in 57 BC under Ptolemy XII Auletes. It was built on the site of an earlier, smaller temple also dedicated to Horus, although the previous structure was oriented east–west rather than north–south as in the present site.