Show page without reference to post (like front-page)

Thanks to toschos hint I could solve the problem. This is the code that I use:

// Register the endpoint
function my_init() {
    add_rewrite_endpoint('votes', EP_ALL);
}
add_action('init', 'my_init');


// Execute a function when the endpoint is called
function my_redirect() {
    global $wp_query;

    if (isset($wp_query->query_vars['votes'])) {
        $wp_query->is_404 = false;
        add_filter( 'wp_title', 'my_title_votes', 10, 2 );
        // this will output the template-file "all-votes.php"
        get_template_part( 'all-votes' );
        // Prevent WordPress from adding the front-page or 404 page to my output...
        die();
    }
}
add_action( 'template_redirect', 'my_redirect' );

function my_title_votes( $title, $sep ) {
    return 'Votes-Title ' . $sep . ' ' .  $title;
}

When I open the URL mysite.com/votes/ I get my custom output, even though there is no page with that slug 🙂