dryfj.com / drycyclist.com (kevin cook)

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04666-old-spanish-trail-formations-800px.jpg Tecopa off in the distanceThumbnails Old Spanish Trail Highway cuts through the earthTecopa off in the distanceThumbnails Old Spanish Trail Highway cuts through the earthTecopa off in the distanceThumbnails Old Spanish Trail Highway cuts through the earthTecopa off in the distanceThumbnails Old Spanish Trail Highway cuts through the earthTecopa off in the distanceThumbnails Old Spanish Trail Highway cuts through the earth

You could build imitations of these mounds in your backyard for a fake prehistoric look.