If anyone reading this should ever find themselves in the Miami, FL area, go visit the "Coral Castle", in Homestead. One man, Edward Leedskalnin, built it over a 28 year period. He was a Latvian immigrant who only had a 4th grade education, and was definitely NOT an engineer. Everything is made from limestone quarried from the site itself. When Edward bought the property, it was 'out in the boonies', and he had his share of privacy. Edward often worked late at night, never allowed anyone to watch him at work, and never told anyone how he built it or moved the stones around. The average weight of the various pieces is 14 tons each, the heaviest weighs in at over 30 tons