This world has so much knowledge and we brush away some of it as entertainment or conspiracy theories. Since most of us don't really do research or read about other books, scriptiures and text we disregard them without even giving a second thought but this doesn't mean that such topics are made up or stories.
Allah (swt) has touched some subjects in Quran while their details exist in other sources for us to research.
A Simple Argument Team discuss Portals, Time Travel, Pyramids and Islam