<p>Standing on wooden steps that protect a 3,300-year-old stone staircase, Egyptian antiquities chief Zahi Hawass poses in 2009 in a mysterious tunnel that links the ancient tomb of Pharaoh Seti I to ... nothing.</p><p>After three years of hauling out rubble and artifacts via a railway-car system (rails visible at left), the excavators hit a wall, the team announced in July. It seems the ancient workers who created the steep tunnel under <a id="fdle" title="Egypt" href="http://travel.nationalgeographic.com/travel/countries/egypt-guide/">Egypt</a>'s <a id="a1qh" title="Valley of the Kings" href="http://www.nationalgeographic.com/history/ancient/valley-of-the-kings.html">Valley of the Kings</a> near Luxor (<a id="lq2t" title="map" href="http://ngm.nationalgeographic.com/ngm/0301/feature4/map.html">map</a>) abruptly stopped after cutting 572 feet (174 meters) into rock.</p><p><a href="http://news.nationalgeographic.com/news/2010/07/photogalleries/100707-science-ancient-egypt-tomb-tunnel-seti-pharaoh-pictures/"><strong><em>Full story and more pictures: "Secret Tunnel Explored in Pharaoh's Tomb."</em></strong></a></p>

10. Pharaoh's Secret Tunnel Explored

Standing on wooden steps that protect a 3,300-year-old stone staircase, Egyptian antiquities chief Zahi Hawass poses in 2009 in a mysterious tunnel that links the ancient tomb of Pharaoh Seti I to ... nothing.

After three years of hauling out rubble and artifacts via a railway-car system (rails visible at left), the excavators hit a wall, the team announced in July. It seems the ancient workers who created the steep tunnel under Egypt's Valley of the Kings near Luxor (map) abruptly stopped after cutting 572 feet (174 meters) into rock.

Full story and more pictures: "Secret Tunnel Explored in Pharaoh's Tomb."

Photograph by Amr Abdallah Dalsh, Reuters

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