REMOVE

1. mountains
2. machinery
3. barriers
4. rock
5. sheds (storage structures)

WHAT

1. Visual Works (hierarchy n … (1)
2. artists (visual artists) (1)
3. beards (1)
4. benches (furniture) (1)
5. buildings (structures) (1)

More 

WHERE

1. Paradise Island, Bahamas (1)

WHEN

1. 1967 (1)
2. 1971 (1)
3. ca. 1969 (1)