spanish based practice castillo/miras arquitectos has recently restored an observation tower in huercal-overa, spain.

a winding rustic stone path leads visitors up the sides of the existing plateau towards the contemporary structure 
adjacent to the tower. concealed within the minimalist cylindrical form, visitors climb a spiral staircase with intermittent 
panoramic views of the surrounding countryside. upon reaching the highest point, visitors are directed towards a 
pedestrian bridge leading to the towers entry door. beyond the door lies the interior space consisting of vigilantly restored 
brick vaults and wood floors. 

See more amazing photos via castillo/miras arquitectos: restoration of a tower in huercal-overa.