Royal Institute has a series of experiments that can easily be done at home.
The web series ExpeRimental is a collection of short videos explaining how to conduct various experiments in your own kitchen. Each video includes a downloadable info sheet and teachers may want to use the free certificates and badges. The videos are colorful and well edited demonstrations of observational science.
Though geared towards elementary age, anyone with a curious mind will enjoy these fun ways of exploring the world around them. Of course, one possible extension activity would be to video record your own experiments, posting the results.