According to a recent article Legoland is being accused of building concrete foundations over ancient ruins, causing them to be damaged. Apparently Legoland is claiming that the concrete foundations are being made without pile construction to avoid damaging the ruins. Despite this, they are still being criticized because some feel that destruction of the ancient ruins cannot be avoided.
Sources: http://www.chookjenews.kr/news/articleView.html?idxno=43572 and http://www.tongildaily.com/news/articleView.html?idxno=8884