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“The tunnel-like structure is formed when flowing lava hardens near the surface but continues to flow downwards, and the inner lava escapes before hardening. The result, a tube that opens to the surface and leads to the mysterious depths below.”

By far the largest and most elaborate home in tiny Liberty, Kansas, this structure has been abandoned and boarded up. It makes me wonder, why?

Hawaii. Kalapana. "Natural Love" Photograph taken by Cj Kale, via 500px. *Flaming Lava Heart. This has not been 'photoshopped'!