Built for $70,000 in 1976, this underground Missouri concrete home survived a deadly F4 tornado; 50 years later, it remains almost invisible from the road, hidden beneath a hillside

When Tim and Monica open the front door of their home in Springfield, Missouri, there is little to suggest that a house is hidden beneath the hillside outside. Only a small corner of the structure is visible from the road, while much of the home disappears into the earth.

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