Ancient Knowledge and Spiritual Science

I was watching an episode of Ancient Aliens and it had mentioned Einstein's favorite book was Isis Unveiled. The book is a compilation of ancient knowledge with a mix of spiritualism and science. I would recommend this book to anyone that is in search of knowledge. I was able to find the book online for free. The author had some other books about spiritualism. The books are old but the writing is still relevant as if it could have been written recently.

It's hard for us to believe that ancient cultures may have been more knowledgable in some areas than we are today. Just think about the Mayans grasp on astronomy and how accurate they were. Even today knowledge is not spread evenly around the different cultures on earth. Primitive cultures still exist; while others can access info off the web from a cell phone. Even though this is true; primitive cultures may still have knowledge that we do not. For example they may know what plants to use to cure certain ailments. Just to think of all the knowledge lost and destroyed over the centuries by war and natural disasters.