What are the Geographical areas of your Zacatecas research?

Just curious as to where, geographically speaking, your Zacatecas research is located/focused. Did your families move around frequently - i.e., were they in one place for more or less than 5 or 10 years, or for generations? My father was born (1912) at Hacienda del Astillero, SW of Valparaiso, off the Valparaiso-Huejucar Highway (Mex Hwy 44). His father was born at Hacienda de Santa Monica, Sain Alto (1879), his mother at Rancho San Mateo (1887; N of Valparaiso). There is a Santa Monica north of Sain Alto, but it looks pretty desolate on the Google map of the area.
So - is anyone researching the Sain Alto area, or Sombrerete, or Fresnillo? Have you visited any of these places? I visited Astillero in 1996.

Thanks,
Natalie Castro Coleman
researching: GARCIA, DUENAS, CASTRO, MARTINEZ, and others