General:
* Vision
* View
* Perspective
* Outlook
* Observation
Specific:
* For something beautiful or impressive: Spectacle, panorama, scene, vista
* For something unexpected: Glimpse, flash, glance
* For something that can be seen: Visibility, appearance, form, shape
* For the ability to see: Eyesight, vision, perception
The best synonym will depend on the specific meaning and context you're using "sight" for.