The Hollow Earth Enigma by Alec MacLellan

The Hollow Earth Enigma - Alec MacLellan

This is an interesting and well written book that explores the belief that the Earth is hollow and may be inhabited.  This book discusses things such as legends and writings from the earliest civilizations, the aurora borealis, UFOs, giants, fairies, subterranean entrances at the poles, the possible structure of other planets and other phenomenon - not to mention, the idea that the earth's interior is solid is only a hypothesis that has not been definitively proven.  The book is a bit dated and would benefit from newer information.