The San Diego Zoo Kids website has a number of stories, activities, and games all about animals from around the world. There are arts and crafts projects for children of all ages. You can even view live webcams of the animals at the zoo!
Access Mars lets you explore a 3D replica of the Martian surface, exactly as it was recorded by the Curiosity rover. As Curiosity has traveled across Mars, it's taken digital photographs with two stereoscopic camera systems. By combining and analyzing these photographs, scientists at NASA JPL have created a 3D model use to study Mars and plan future experiments.
Google Arts & Culture has created a site where you can explore the Kenai Fjords, Hawai'i Volcanoes, Carlsdbad Caverns, Bryce Canyon, and Dry Tortugas from home. These are beautiful, in-depth tours of these locations, with an interactive, audible guide from each national park.
The California State Capitol Museum’s virtual tours provide you with a unique opportunity to visit California's Capitol from any location in the world. A virtual tour of the 40-acre Capitol Park focuses on monuments, memorials, points of interest, historic personages and events, trees and plantings from around the world, and a World Peace Rose Garden.
The Gentle Barn is an animal sanctuary for abused animals who normally wouldn't have a new home. Their organization runs a number of animal-assisted therapy programs. They are posting daily videos of animals at the farm. You can watch these live or view their playlist of previous videos.
Locate and learn about thousands of flowers, plants, and trees in over 120 acres of stunning gardens with the botanical collections tours.