You can find a list of zoo and aquarium live streams here!
GeoGuessr is a game where you are randomly dropped somewhere in the world via Google Street View and have to guess where you are. Great for exploring the world remotely!
rave.dj is a site that uses AI to mash up songs (to mixed results). Try pasting in songs from Youtube to see what monstrosities you can create.
Play some classic arcade games at the Internet Archive!
Tour the Louvre, the Smithsonian National Portrait Gallery, and other museums using this list of online tours.
Kanopy is a streaming service available through the University of Colorado Boulder library system with a great collection of documentaries, classic cinema, and art films.
Tabletopia is resource for playing board games online, from Parcheesi to Scythe.