General:
* Looted
* Plundered
* Sacked
* Despoiled
* Ravaged
* Destroyed
* Wrecked
* Demolished
* Trashed
* Torn apart
* Turned upside down
* Searched thoroughly (if the focus is on the search rather than the damage)
More specific:
* Burgled (if the focus is on a theft)
* Robbed (if the focus is on the theft)
* Stripped (if the focus is on the removal of valuable items)
* Cleared out (if the focus is on the complete removal of everything)
The best synonym will depend on the specific context in which you are using the word.