Ancient Aliens on Mars

Was there once a vast, technologically advanced civilisation on Mars and did it leave evidence of its existence behind for humans to find eons later? Did these advanced extraterrestrial visitors vanish in a solar system wide cataclysm of their own making, only to make their way to Earth and start anew? Was Mars once as lush and green as the Earth and teeming with life? Mike Bara answers these questions and much more in this book.