My Oma, Bertha Johanna van Agtmaal was from the SasVan Gent, Netherlands and her father Adriann van Agtmaal, grandfather Adriann van Agtmaal and great grandfather had a sugar beet farm.

My Grandfather(Bon PaPa) Walter Lambert Teller was from Seilles, Belgium and his father Constant Charles Teller owned a foundry. Their home was a very large place and they called it "Tramaca Canteau".

I was wondering if any of these places are still there. During WWII they were taken over by Nazi's and the homes were used for their own personal uses, especially the Teller's home. How do I find info on these places and the family names.
Thank you