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The Hypogeum is an enormous subterranean structure excavated c. 2500 B.C., using cyclopean rigging to lift huge blocks of coralline limestone. Perhaps originally a sanctuary, it became a necropolis in prehistoric times.<ref>http://whc.unesco.org/en/list/130</ref>
== See also ==
*[[List of World Heritage Sites in Europe and North America]]
== External Links ==
*[http://heritagemalta.org/museums-sites/hal-saflieni-hypogeum/ Webpage of the Hypogeum]
== References ==
{{reflist}}
[[Category:Malta]]