This image shows a bridge along the Trans Canada highway, with tourists admiring the view and taking pictures for souvenirs.
Alutone Reproductions by E. S. & A. Robinson (Canada) Limited, Leaside, Ontario
The description states:
CANDIAN LAKE SUPERIOR POST CARD SERIES
Trans Canada Highway east of the lake head cities of Port Arthur and Fort William, Ontario.
–Both the cities mentioned above, and a few others, were combined administratively into a single city named Thunder Bay, which is located near the US-Canadian border with Minnesota.
This card likely dates from the 1950s.