The round stone in the roadway opposite this point marks the spot where on Wednesday the 18th December 1917 at 8:10 pm a bomb from a German aeroplane struck the ground and exploded shattering the windows in Stone Buildings and doing other material damage.
Some of the "other material damage" can be seen in the pock-marks in the stone wall behind the plaque.
Site: Stone Buildings (2 memorials)
WC2, Stone Buildings, 10
When, on the opening of the Law Courts in 1882, no 10 became vacant the Inns of Court Rifle Corps moved in.
Lincoln's Inn provides a good history of Stone Buildings.