<?php
/**
 * Template Name: Gallery Page
 *
 */

 if ( have_posts() ) {
    while ( have_posts() ) {
        the_post();
        function pw_show_gallery_image_urls( $content ) {

    global $post;

    // Only do this on singular items
    if( ! is_singular() )
        return $content;

    // Make sure the post has a gallery in it
    if( ! has_shortcode( $post->post_content, 'gallery' ) )
        return $content;

    // Retrieve the first gallery in the post
    $gallery = get_post_gallery_images( $post );

    $image_list = '<ul>';

    // Loop through each image in each gallery
    foreach( $gallery as $image_url ) {

        $image_list .= '<li>' . '<img src="' . $image_url . '">' . '</li>';

    }

    $image_list .= '</ul>';

    // Append our image list to the content of our post
    $content .= $image_list;

    return $content;

 }
 add_filter( 'the_content', 'pw_show_gallery_image_urls' );
    } // end while
} // end if
?>

function pw_show_gallery_image_urls( $content ) {

  global $post;

  // Only do this on singular items
  if( ! is_singular() )
      return $content;

  // Make sure the post has a gallery in it
  if( ! has_shortcode( $post->post_content, 'gallery' ) )
      return $content;

  // Retrieve the first gallery in the post
  $gallery = get_post_gallery_images( $post );

  $image_list = '<ul>';

  // Loop through each image in each gallery
  foreach( $gallery as $image_url ) {
      $image_list .= '<li>' . '<img src="' . $image_url . '">' . '</li>';
  }

  $image_list .= '</ul>';

  // Append our image list to the content of our post
  $content .= $image_list;

  return $content;
}
add_filter( 'the_content', 'pw_show_gallery_image_urls' );

if ( have_posts() ) {
  while ( have_posts() ) {
    the_post();

  } // end while
} // end if

if ( have_posts() ) {
  while ( have_posts() ) {
    the_post();
    the_content(); // minimum
  } // end while
} // end if