diff --git a/lib/Museum.php b/lib/Museum.php
index 8190779a..b801422d 100644
--- a/lib/Museum.php
+++ b/lib/Museum.php
@@ -537,21 +537,21 @@ class Museum{
 
 			return $outputUrl;
 		}
-		elseif(preg_match('/\bart\.pl$/ius', $parsedUrl['host'])){
-			$exampleUrl = 'https://cyfrowe.mnw.art.pl/en/catalog/445066';
+		// elseif(preg_match('/\bart\.pl$/ius', $parsedUrl['host'])){
+		// 	$exampleUrl = 'https://cyfrowe.mnw.art.pl/en/catalog/445066';
 
-			if($parsedUrl['host'] != 'cyfrowe.mnw.art.pl'){
-				throw new Exceptions\InvalidMuseumUrlException($url, $exampleUrl);
-			}
+		// 	if($parsedUrl['host'] != 'cyfrowe.mnw.art.pl'){
+		// 		throw new Exceptions\InvalidMuseumUrlException($url, $exampleUrl);
+		// 	}
 
-			if(!preg_match('|^/en/catalog/[^/]+?$|ius', $parsedUrl['path'])){
-				throw new Exceptions\InvalidMuseumUrlException($url, $exampleUrl);
-			}
+		// 	if(!preg_match('|^/en/catalog/[^/]+?$|ius', $parsedUrl['path'])){
+		// 		throw new Exceptions\InvalidMuseumUrlException($url, $exampleUrl);
+		// 	}
 
-			$outputUrl = 'https://' . $parsedUrl['host'] . $parsedUrl['path'];
+		// 	$outputUrl = 'https://' . $parsedUrl['host'] . $parsedUrl['path'];
 
-			return $outputUrl;
-		}
+		// 	return $outputUrl;
+		// }
 		elseif(preg_match('/\blenbachhaus\.de$/', $parsedUrl['host'])){
 			$exampleUrl = 'https://www.lenbachhaus.de/en/digital/collection-online/detail/hymnus-an-michelangelo-30036437';
 
diff --git a/www/contribute/how-tos/how-to-choose-and-create-a-cover-image.php b/www/contribute/how-tos/how-to-choose-and-create-a-cover-image.php
index 8a4c0f7b..3eef3461 100644
--- a/www/contribute/how-tos/how-to-choose-and-create-a-cover-image.php
+++ b/www/contribute/how-tos/how-to-choose-and-create-a-cover-image.php
@@ -304,8 +304,6 @@
 									<dd>CC0 items say “License: CC CC0 1.0” under the “License information” section. In the art metadata, “Owner of collection” <strong>must</strong> be “Lillehammer Kunstmuseum.” Any other art on <a href="https://www.digitaltmuseum.no">digitaltmuseum.no</a> or <a href="https://www.digitaltmuseum.se">digitaltmuseum.se</a> must be cleared separately.</dd>
 									<dt><a href="https://zbiory.mnk.pl/">National Museum in Krakow</a></dt>
 									<dd>CC0 items say "CC0 - Public Domain" under the Copyright section.</dd>
-									<dt><a href="https://cyfrowe.mnw.art.pl/en/home">National Museum in Warsaw</a></dt>
-									<dd>CC0 items say “CC0 — Public domain” under the “Copyrights’ section.</dd>
 									<dt><a href="https://www.nationalmuseum.se/en/explore-art-and-design/images/free-images">National Museum in Stockholm</a></dt>
 									<dd>CC-PD items have the CC-PD mark in the lower left of the item’s detail view.</dd>
 									<dt><a href="https://dams.birminghammuseums.org.uk/asset-bank/action/viewDefaultHome">Birmingham Museums</a></dt>