display for a 500 gallon tank

Hello everyone,I have a buddy who has a 500 gallon setup and he is looking to put some big display caves in it.It is fish only and he asked me to put a thread up to see if anyone out there has or knows of someone who makes big display caves ???? I guess huge pieces of live rock would also do if aquascaped right but I think he is leaning more toward the artificial route.Any help or links would be great and thanks.
 
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