Torre de la Arenilla, 16th century coastal defense fort in Palos de la Frontera, Spain
Torre de la Arenilla is a masonry watchtower standing on the eastern bank where the Tinto and Odiel rivers meet the sea. The structure has a square plan with thick walls and sits on a protective stone base.
The watchtower was built between the late 1500s and early 1600s under orders from King Felipe II. It formed part of a coastal defense network stretching from Gibraltar to Ayamonte.
The tower received recognition as a Cultural Heritage Site in 1985, highlighting its role in Spain's maritime defense system against pirates and foreign powers.
Entry to the interior is through an elevated door that leads to a spiral staircase climbing to the upper terrace. The ground can be slippery and uneven, so sturdy footwear is advisable.
Inside the tower sits a well covered by a brick vault that served as a water supply for the garrison. The structure also has an unusual bricked-up window that differs from typical regional watchtowers.
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