<?php $cats = get_categories();
            foreach ($cats as $cat) {
                $cat_id = $cat->term_id;
                echo '<div class="'.$cat->name.'">';
                echo '<h3>'.$cat->name.'</h3>';
                echo '<a href="'.$category_link = get_category_link( $category_id ).'" class="pull-right">View more <span class="fa  fa-angle-double-right"></span></a>';
                echo '<ul class="recent-works row">';
                query_posts("cat=$cat_id&post_per_page=4");
                    if (have_posts()) : while (have_posts()) : the_post(); ?>
                        <?php
                            $classes = array(
                                'col-xs-12',
                                'col-sm-6',
                                'col-md-3'
                            );
                        ?>
                        <li <?php post_class( $classes ); ?> id="post-<?php the_ID(); ?>">
                            <a href="<?php $thumb_id = get_post_thumbnail_id( $post->ID );?>
                            <?php $image = wp_get_attachment_image_src( $thumb_id,'full' ); ?>
                            <?php echo $image[0]; ?>" data-gallery>
                                <?php the_post_thumbnail('large', array('class' => 'img-responsive')); ?>
                            </a>
                        </li>
                    <?php endwhile; endif; ?>
                </ul>
                </div>
            <?php }