Cemeteries are meant to be visited. Unless the cemetery is serving the community as a positive, useful, fun, or informative place, it's going to get abandoned, run-down, overgrown, or forgotten.
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One of the practical ramifications of this finding - that the strict regimentation of ant society into castes helps protect their young and their queens from epidemics - is that if you get your kid one of those ant colony toys for Christmas, the resultant ant infestation in your house will be long lived and resistant to epidemics.