Walking from Boosbeck to Margrove Park, known locally as Maggra, the path follows the route of the old Guisborough to Brotton branch line. The line was opened in 1865 servicing the East Cleveland ironstone mining communities.
Hidden in the woods beside the path is one of the kilns from Carrs Tilery which operated from 1867 until 1879 and produced land drains, pipes and tiles for the Skelton Estate and the local ironstone mines.
Pipes produced in the the kiln can found in the undergrowth. The buttresses supporting the walls appear to be later additions.

I’ve been unable to find out if there is any level of official protection on this building.
Remnants from the past and present
The ponds are now a nature reserve managed by the Tees Valley Wildlife Trust, beautiful orchids line the footpath.
This area was once home to a thriving mining community with an ironstone mine located at each end of the small valley. The few structures that remain of this industry and being allowed to decay, which is a shame when so little is left.
Boosbeck
Bosbek 1375 Barbour’s Bruce
‘Stream near the cowshed’ from OE bos(ig) and bekkr.
Margrove Park / Maggra Park
Magerbrigge 1230-50 Guis
Maugrepark 1407 YI Maugrey 1575 FF
v. pearroc. The form Maugre– possibly indicates that the first element is the OE pers. name Maepalgar; cf. Meagre
Sources
Hidden Teesside
Tees Valley Wildlife Trust
East Cleveland Image Archive
The Place Names of the North Riding of Yorkshire by A H Smith. 1928
Thanks to Chris Wynn