As a result of the COVID-19 virus museums and galleries have shut their doors to the public in order to encourage social distancing, however, they also have very active and interesting websites full of images and information to explore and fill your time.
This is just a partial list of all of the museums and galleries all over the world available for a virtual visit:
The Metropolitan Museum of Art in New York City
The Joslyn Art Museum in Omaha, Nebraska
The American Museum of Natural History in New York City