It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.
Google Arts & Culture has a collection of more the 500 different museums and galleries up on its site that you can visit virtually.You can check out the full (massive) list of included galleries and museums here. The list defaults to listing some of the most popular options first, but you can also sort them in alphabetic order or look at where they all are on a map.