<?php
$args = array(
	'posts_per_page' => 6,
	'post_type'      => 'post',
	'post_status'    => 'publish',
	'orderby'        => 'post_views',
	'order'          => 'DSC'
);

$query = new WP_Query( $args );
if ( $query->have_posts() ) : ?>
	<?php while ( $query->have_posts() ) : $query->the_post(); ?>
		<h1><a href="<?php the_permalink(); ?>"><?php echo get_the_title(); ?></a></h1>
		<?php endwhile; endif; ?>