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* {margin:0;padding:0;border:0 none; position: relative;}
*,*:before,*:after {box-sizing:inherit;}
html {
	box-sizing:border-box;
	background: #c6d9d3;
	font-family: Helvetica,Arial,san-serif;
}
.hide {display: none;}
@media only screen and (min-width: 800px) {
.wrap {
	display: grid;
	grid-template-columns: repeat(auto-fill,minmax(calc(8rem + 5vw + 5vh),1fr));
	grid-gap: 2.5vmin;
	padding: 2.5vmin;
}	
#dense:checked + .wrap {
 grid-auto-flow: dense;
}
figure:first-child {
    grid-row-start: span 3;
    grid-column-start: span 3;	
}
/*
figure:last-child {
    grid-row-start: span 6;
    grid-column-start: span 6;	
}
figure:nth-child(odd) {
    grid-row-star: span 2;
    grid-column-start: span 3;	
}
*/
figure:nth-child(even) {
    grid-column-star: span 3;
}
figure:nth-child(2n+3) {
    grid-row-start: span 3;
}
figure:nth-child(4n+5) {
    grid-column-start: span 2;
		grid-row-start: span 2;
}
figure:nth-child(6n+7) {
    grid-row-start: span 2;
}
figure:nth-child(8n+9) {
    grid-column-start: span 2;
    grid-row-start: span 3;
}
img {
	width: 100%;
	height: 100%;
	display: block;
	object-fit: cover;
	box-shadow: 0 0 3px #496b7b;
	border-radius: 5px;
}
	figure {
    counter-increment: numImg;
	}
	figure::after {
		background: rgba(73,107, 123,.75);
		content: counter(numImg);
		position: absolute;
		top: 0%;
		left: 0;
		font-size: 2rem;
		color: #c6d9d3;
		width: 4rem;
		height: 4rem;
		line-height: 4rem;
		text-align: center;
		border-radius: 0 50% 50% 0;
		
		
	}
}

figure,
img {
	transition: .4s;
}
label {
	background: rgba(73,107, 123,.75);
	position: fixed;
	top: 0;
	left: 50%;
	transform: translateX(-50%);
	font-size: 1.5rem;
	font-weight: 100;
	color: #fff;
	text-align: center;
	letter-spacing: 2px;
	padding: 1rem;
	cursor: pointer;
	box-shadow: 0 0 3px rgba(25,42, 46,.75);
}
label span {
	background: #b1cccb;
	display: block;
	font-variant: small-caps;
	font-size: 150%;
	color: #496b7b;
}
label span::after {
	content: ' initial';
}
#dense:checked ~ label span:after {
	content: ' dense';
}
a {color: #f7e371}
figcaption {
	background: rgba(73,107,123,.75);
	position: absolute;
	bottom: 0;
	left: 0;
	width: 100%;
	padding: 1rem;
	font-weight: 100;
	line-height: 1.5;
	color: #fff;
}

<input type='checkbox' checked id='dense' class='hide' />
<div class='wrap'>
	<figure><img src='https://unsplash.it/800/450?image=1011' alt /></figure>
	<figure><img src='https://unsplash.it/600/850?image=11' alt /></figure>
	<figure><img src='https://unsplash.it/900/850?image=1075' alt /></figure>
	<figure><img src='https://unsplash.it/900/650?image=14' alt /></figure>
	<figure><img src='https://unsplash.it/900/650?image=15' alt /></figure>
	<figure><img src='https://unsplash.it/900/650?image=16' alt /></figure>
	<figure><img src='https://unsplash.it/900/650?image=17' alt /></figure>
	<figure><img src='https://unsplash.it/900/650?image=18' alt /></figure>
	<figure><img src='https://unsplash.it/900/650?image=19' alt /></figure>
	<figure><img src='https://unsplash.it/900/650?image=20' alt /></figure>
	<figure><img src='https://unsplash.it/900/650?image=21' alt /></figure>
	<figure><img src='https://unsplash.it/900/650?image=23' alt /></figure>
	<figure><img src='https://unsplash.it/900/650?image=24' alt /></figure>
	<figure><img src='https://unsplash.it/900/650?image=25' alt /></figure>
	<figure><img src='https://unsplash.it/900/650?image=26' alt /></figure>
	<figure><img src='https://unsplash.it/900/650?image=27' alt /></figure>
	<figure><img src='https://unsplash.it/900/650?image=28' alt /></figure>
	<figure><img src='https://unsplash.it/900/650?image=29' alt /></figure>
	<figure><img src='https://unsplash.it/900/650?image=30' alt /></figure>
	<figure><img src='https://unsplash.it/900/650?image=33' alt /></figure>
	<figure><img src='https://unsplash.it/900/650?image=34' alt /><figcaption>Please, show the pen & <a href='https://escss.blogspot.com/2017/07/css-grid-layout-as-masonry.html'>link the post</a>. Thanks.</figcaption>
	</figure>
	<figure><img src='https://unsplash.it/900/350?image=35' alt /></figure>
	<figure><img src='https://unsplash.it/900/350?image=42' alt /></figure>
	<figure><img src='https://unsplash.it/900/350?image=46' alt /></figure>
</div>

<label for='dense'>change the value of <span>grid-auto-flow:</span> look at the Nº & empty spaces<br/>IDEA: resize the window<br/>
	More #impoCSSible inside <a href='https://escss.blogspot.com/search/label/demo'>my blog </a></label>