A lost Da Vinci fresco may lie inside a 14th-century wall, and only a special camera, yet to be built, can see it.<img src="http://feeds.feedburner.com/~r/DiscoveryNews-Top-Stories/~4/isyUweudUVY" height="1" width="1"/>
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A lost Da Vinci fresco may lie inside a 14th-century wall, and only a special camera, yet to be built, can see it.<img src="http://feeds.feedburner.com/~r/DiscoveryNews-Top-Stories/~4/isyUweudUVY" height="1" width="1"/>