The weight of a house comes down through the walls & columns. This weight is supported by footings. The footing is a wide thick base the spreads the weight from above out over a larger area of earth. Great care is taken that the earth under the footing is virgin earth, earth that has not been disturbed. The wooden frames (form work) will hold the poured concrete in place till it sets up. The box in the for ground is most likely for a fireplace and chimney.
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