Romania has stones that grow, secrete cement, take in water, contain growth layers reminiscent of tree rings, bud new accretations, and are even reported by some to move. Geologists naturally cover up with a prosaic, if unusual,
explanation. But we know what's really going on.
If you want to tour the area, be sure to pack around a hundred pounds of thermoconcrete. You know, the kind we use to build emergency shelters out of? It's mostly silicon.