At Home Activities
National Parks Virtual Tours from Upgraded Points: 62 Virtual Tours of Iconic National Parks Around the U.S. 
Department of Defense: Learn about careers in STEM fields
Department of Education National Center for Education Statistics: Kids' Zone
Environmental Protection Agency: Games, Quizzes, and Videos about the Environment
The Library of Congress: Presentations and Activities to Help Students Learn about History
The Smithsonian: Free Smithsonian STEM Games and Simulations; Meet the Animals of the National Zoo; 3D Exhibits and Virtual Tours; Smithsonian Magazine Ten Museums You Can Virtually Visit; The Museum of Natural History Virtual Tour; Digital Smithsonian American Art Museum; Distance Learning Resources
UP has an online article, "The 75 Best Virtual Museum Tours Around the World"
The exhibition “Picasso, Chagall, Jawlensky” at the Kunstmuseum Basel had a virtual tour. The museum has the largest art collection in Switzerland.