This is the 13152nd most frequent Russian word.
местом
"Местом" means "place" or "location" in English (instrumental case of "место").
Here, 'местом' (ablative case of 'место') is used to describe a location.
Это местом было одним из самых красивых мест, которые я когда-либо видел.
This place was one of the most beautiful places I have ever seen.
'Местом' here refers to a concrete location assigned for an activity, in instrumental case.
Местом встречи назначили центральную площадь.
The meeting place was set as the central square.
In this case, 'местом' demonstrates a designation or determination of a location.