REMOVE

1. rock
2. buildings (structures)
3. national parks
4. 1973

WHAT

1. Visual Works (hierarchy n … (1)
2. bridges (built works) (1)
3. civil wars (1)
4. color film (film) (1)

More 

WHERE

1. Harpers Ferry, West Virgi … (1)

WHO

1. Still, Patricia (1)

WHEN

1. 1973 September 13 (1)