REMOVE

1. sweaters
2. rivers
3. sitting
4. barriers
5. monuments
6. benches (furniture)

WHAT

1. Visual Works (hierarchy n … (1)
2. black-and-white film (1)
3. bushes (1)
4. cupolas (1)
5. doors (1)

More 

WHERE

1. New Windsor, Maryland (1)

WHEN

1. 1966 (1)
2. after 1966 (1)