The Hidden Paths

Several years ago I became interested in the ideas of real time travel and dimensional travel. I've been trained in science and modern physics as well as engineering so I knew that modern theories of our physical world did not include the possibilities that time or dimensional travel existed. As I did my research on stories of people who had travelled through time or additional dimensions there were many very credible stories.
These stories eventually led me to conclude that time or dimensional travel through portals or veils does exist and some persons have experienced it. On a book I wrote about the Tuatha Da Dannon who were the forerunners of elves, the Druids, and more there were stories that they originated in a different dimension called the Otherworld. And there were some interesting stories of humans who had traveled to the Otherworld and back. It also turns out that the more one studies these subjects the more historical stories there are of portal, dimensional, and time travel experiences people have had. This book then is a detailed review and exploration of portals around the world.
Some of which are very plausible and others just might exist. Also could these portals be used today? There are also lots of stories of individuals travelling through time and dimensional portals. There are lots of interesting questions on this subject and we are just starting to learn the answers.