Recursive unrar of several folders

find Photos/ -name '*.rar' -execdir unrar e {} \; 

unrar has built-in recursion using the -r Recurse subdirectories switch.

unrar x -r <parent directory> Extracts contents of all subdirectories under <parent directory> into each subdirectory, keeping any directory structure that exists in the .rar files. Use e instead of x if directory structure is unwanted.

If you want to move the unrar'd photos to another destination, just enter the destination in the end, like this:

find source_dir/ -name '*.rar' -execdir unrar e -o- {} /new/destination_dir/ \;