Wat Chai Mongkhon (วัดชัยมงคล) is a small, woodsy temple in the village Na Hua Bo, which is adjacent to the "zombie village" of Ban Na Sao Nan in the Phanna Nikhom district of Sakon Nakhon. But don't expect to see any zombies or ghouls on your visit to this temple. The bad spirits have long disappeared thanks to the holy well which was built.
If you would like to visit that nearby sacred well, it is identified on Google Maps as the “Ban Na Sao Nan Community Primary Health Care Center”. While the well water allegedly has rejuvenating, healing properties which rid the community of ghouls, we wouldn't suggest drinking from the well yourself. Best to leave such practices only to the locals.
There are several temples in Sakon Nakhon named Wat Chai Mongkhon, which translates to "The Temple of Auspicious Victory" — the victory being your conquering of self via the teachings of the dharma. Perhaps the most interesting feature of this Wat Chai Mongkhon is its large Bo Tree (Ficus Religiosa). It has a fascinating trunk and enormous canopy. It stands in front of the temple's Viharn, where the villagers gather to make merit and receive blessings from the monks. Turn right at the Bo tree, and you'll see the temple's crematorium, which serves all nearby villages.