<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://npmcdn.com/masonry-layout@4.0/dist/masonry.pkgd.js"></script>
<div class="grid-container">
<div class="grid">
<div class="item"><img src="http://dummyimage.com/340x400/000/fff"></div>
<div class="item"><img src="http://dummyimage.com/400x200/000/fff"></div>
<div class="item"><img src="http://dummyimage.com/250x350/000/fff"></div>
<div class="item"><img src="http://dummyimage.com/340x400/000/fff"></div>
<div class="item"><img src="http://dummyimage.com/600x400/000/fff"></div>
<div class="item"><img src="http://dummyimage.com/340x400/000/fff"></div>
<div class="item"><img src="http://dummyimage.com/340x400/000/fff"></div>
<div class="item"><img src="http://dummyimage.com/340x400/000/fff"></div>
<div class="item"><img src="http://dummyimage.com/340x400/000/fff"></div>
</div>
</div>