While the construction crew building the Hotel Indigo dug deep, the remains of an 18th century ship’s fifty-foot hull was unearthed at 220 South Union Street in Old Town, Alexandria.
It had been scuttled sometime in the late 1700s when the town used it as part of the landfill for the waterfront which was extended out to a deeper part the Potomac River. The new waterfront allowed Alexandria to become a thriving international port. 
In photo: Before the landfill (late 1700s), the waterline went to where the crane is located.
3-D laser scanning, photographs and measurements have been completed and now the ship is being dismantled so it can be moved to a wet environment for further study and hopefully conservation. 
For more information about this and other discoveries in Old Town, go to: Alexandria Archaeology Museum which is located in the Torpedo Factory on King Street.
When they announced the area would be open to the public for two hours, I was hoping to get onto the construction site for a closer look but it was not to be.
Displaced Beachbums 