What is this tower I found in Spain?

What is this tower I found in Spain? - Brown Concrete Building Under Blue Sky

42º37'46.6"N, 2º5'12.15"W

No openings on three sides. Door and windows face south. No other openings except ditch from underneath, going north to point straight at Azqueta, but it only goes a short distance. Seems at one time to have had a pipe going from bottom to top. No signage.

Pipe makes me think of water, but it is on top of a hill, and it is a long way from any point higher or to any village.

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What is this tower I found in Spain? - Brown Concrete Building Under Blue Sky
What is this tower I found in Spain? - Group of People Walking in Front of Sagrada Familia Cathedral
What is this tower I found in Spain? - People Gathering Near Plaza





Why 70% of Spain is Empty




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Images: Mehmet Turgut Kirkgoz, Mehmet Turgut Kirkgoz, Olena Ukraine, Mati Angulo