REMOVE

1. paths
2. fences
3. machinery
4. black-and-white film
5. construction equipment
6. barriers

WHAT

1. Visual Works (hierarchy n … (1)
2. buildings (structures) (1)
3. bushes (1)
4. children (1)

More 

WHERE

1. Westlock, Alberta, Canada (1)

WHEN

1. 1946 (1)
2. after 1946 (1)