Mount Vernon Scanning its Way to the 18th Century

MOUNT VERNON, Va. (AP) — It's one of the first questions that occurs to a visitor at George Washington's Mount Vernon estate: How much of the mansion really dates back to Washington's time, and how much has been replaced?

The estate is in the midst of a project that will help answer that question, down to every nail in the floorboards.

Continue reading this article at...

http://news.yahoo.com/mount-vernon-uses-lasers-scan-mansion-down-nail-154147013.html