REMOVE

1. paths
2. houses
3. rivers
4. barriers
5. railroads
6. Grand Coulee Dam (dam)

WHAT

1. Visual Works (hierarchy n … (1)
2. artists (visual artists) (1)
3. baseball (field sport) (1)
4. benches (furniture) (1)
5. black-and-white film (1)

More 

WHERE

1. New York, New York (1)

WHEN

1. 1957 (1)