Ancient history and the treasures of bygone civilizations are one of the favorite themes of casino game creators. Slots inspired by ancient eras are colorful and exciting. When the gambler wins a prize in them, it seems he got a real treasure from an ancient hiding place! A great example of slots is Book of Ra from the famous manufacturer Novomatic. This slot is found in many online casinos, has become an absolute classic of the genre, and has acquired many fans.