This is the (presumably) former telephone exchange in Maidwell. There is a later building next to it that may have been an exchange too and is also disused, but as with all official buildings in rural areas, you will find a sign threatening you with all sorts of penalties if you trespass.
I was rather taken with this old exchange as it resembles a little abandoned chapel. I have seen it from the bus many times finally got to photograph it today.
This arch, according to the commemorative stone on the left:
This gateway restored by Reginald B. Loder
was opened on 6th May 1914 by
Field Marshal Lord Grenfell P.C., G.C.B., G.C.M.G.
President of the Royal Horticultural Society
You can read about Field Marshal Grenfell on a family history site.
And this is the remains of a footbridge that carried a footpath between Maidwell and Draughton across the old Market Harborough to Northampton railway. (It closed in 1981: I was on the last train.)
The wooden treads have been removed leaving the ironwork, which is decorative but now incongruously industrial for its rural location.