Gordon MacMillan Southam Observatory as Yonkers Observatory
Jack and Teal'c visit an observatory to confirm the first solar flare indicated on the note from General Hammond.
“1969” Filming Locations
Stargate SG-1 episode “1969” was filmed in Vancouver in Canada.
Kitsilano Cottage By the Sea as Catherine's House
Daniel and Sam visit a young Catherine in order to learn where the Stargate is being stored.
Source: Stargate SG-1 Locations
Seaforth Armoury as Washington D.C. Armory
SG-1 tracks the Stargate to a military warehouse and use it to travel back to the future.