An old, weathered chimney stack made of stone or concrete stands against a clear blue sky in Cerdanyola del Vallès, Spain

An old, weathered chimney stack made of stone or concrete stands against a clear blue sky in Cerdanyola del Vallès, Spain. The chimney's surface is discolored with dark staining and exhibits significant material degradation, including spalling and visible mortar loss. Its upper section features a darker, rectangular cap with open sides covered by curved, reddish-brown terracotta tiles. Below the chimney, multiple rows of similarly aged, curved terracotta roof tiles are visible. The base of the roof tiles rests on a visible section of a wall constructed from reddish-brown bricks. No people, animals, or other transient objects are present in the frame.