HERCULANEUM, Mo. (News First) – Governor Daniel Dunklin’s Grave State Historic Site in Herculaneum is closed until further notice to the public. That’s according to the park’s website. It says crews need to address trail damage caused by the heavy rainfall and flooding that happened in early November. In fact, the path to the gravesite washed away and is inaccessible. No timeframe was given on when the site will open back up to the public.