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It really has no informative signs on it just signs warning not climb or careful with your ball. It is in a Japanese park. I thought it is a water mound with its lots of pipes coming out it for aquifer to water the park. enter image description here

Tightly stonework like a Japanese castle

Some barbed wire fenced off plants

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    $\begingroup$ That is a retaining wall. The pipes are weep holes that allows water to come out so that it will not build into additional pressure. :) $\endgroup$
    – Jem Eripol
    Oct 8 '17 at 4:49
  • $\begingroup$ It is a four sided structure- why? $\endgroup$ Oct 8 '17 at 5:48
  • $\begingroup$ I am not sure what structure lies above it based on your picture, but having some fences above it, it must be very important. How long do you think it is in both sides? $\endgroup$
    – Jem Eripol
    Oct 8 '17 at 6:38
  • $\begingroup$ 10 metres by 5 metres- nothing important just plants- no easy access possible. $\endgroup$ Oct 9 '17 at 3:42
  • $\begingroup$ giving the name of the park might be useful. There could be some historical significance. Not really an engineering question though. $\endgroup$
    – agentp
    Oct 9 '17 at 11:24
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As Jem Eripol points out, it is to prevent erosion / collapse of the earth above it. Likely the land was cleared and leveled to produce the park, and to prevent the hillside above it from filling in the space, the retaining wall was added. There is also the element of the designer thinking it "looked cool" -- that is a function in and of itself.

Hope that helped.

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  • $\begingroup$ Thanks for your reply but it is a contained area/ building- why not just remove the soil. It look hideous. Who would want a built inaccessible area in a park. $\endgroup$ Oct 26 '17 at 3:19

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