ductos

spot_type_outdoor

spot_feature_walls, spot_feature_forest, spot_feature_pit, spot_feature_view

i really don´t know which would be the english for the word for this things but this are structures made of bricks that are used to ventilate the subway, they have different heights and sizes. They are on the grass so if it rains you will find mud but in that case, there is another spot near, under the freeway.