From I-93 North Exit 3:

Left on 111 (heading west)
Go 2.8 miles to 6th traffic light
Left on London Bridge Road
Go 0.6 miles to see WHS sign on left.
Turn left into drive for WHS

From I-93 South Exit 3:

Right on 111 (heading west)
Go 2.2 miles to 5th traffic light
Left on London Bridge Road
Go 0.6 miles to see WHS sign on left.
Turn left into drive for WHS