What is "nuraghe"

Nuraghe \Nu*ra"ghe\, n.; It. pl. -ghi. Also Nuragh \Nu"ragh\, etc.[It. dial. (Sardinia) nuraghe).] One of the prehistoric towerlike structures found in Sardinia.

The so-called nuraghi, conical monuments with truncated summits, 30-60 ft. in height, 35-100 ft. in diameter at the base, constructed sometimes of hewn, and sometimes of unhewn blocks of stone without mortar. They are situated either on isolated eminences or on the slopes of the mountains, seldom on the plains, and usually occur in groups. They generally contain two (in some rare instances three) conically vaulted chambers, one above the other, and a spiral staircase constructed in the thick walls ascends to the upper stories.
--Baedeker.

n. (label en archaeology) dry-stone round (l/en: megalithic) tower found in (l/en: Sardinia).

The nuraghe (plural Italian nuraghi, Sardinian Logudorese nuraghes / Sardinian Campidanese nuraxis) is the main type of ancient megalithic edifice found in Sardinia, developed during the Nuragic Age between 1900 and 730 BCE. Today it has come to be the symbol of Sardinia and its distinctive culture, the Nuragic civilization. More than 7000 nuraghi have been found, though archeologists believe that originally there were not fewer than 10,000.