One file for all routes is bad idea. For simplify this, look this snippets.
// helpers.php
if (!function_exists('routes')) {
/**
* Return Routes Path
* @return string
*/
function routes()
{
return app_path() . '/Routes/';
}
}
// routes.php
Route::group(array('prefix' => 'admin', 'before' => 'auth|inGroup:Administrators'), function () {
require(routes(). 'Admin.php');
});
// Now your admin routes are Routes/Admin.php