They did go every where.
"Fascinating. I'm going to order that book."
You may consider Schoch's book also. He extends Opperhiemer's ideas and references his work in Voyages Of The Pyramid Builders. It's an easy read as compared to Eden In The East.
Voyages of the Pyramid Builders
Robert M. Schoch, Ph.D. discusses in this book, not only the geographic diversity and cultural of similarity of pyramids all around the world, but discusses how that technology would travel across oceans in the Ancient world. The pictures, bibliography, and read are worth the price of the book. This is a comprehensive study, the only book you will need on this subject. The links between ancient Hebrews, Old Testament Prophets, and the building of the pyramids, is precious a must have for those who are interested in pyramids around the world or in America before Columbus.
Is it a mere coincidence that pyramids are found across our globe? Did cultures ranging across vast spaces in geography and time, such as the ancient Egyptians; early Buddhists; the Maya, Inca, Toltec, and Aztec civilizations of the Americas; the Celts of the British Isles; and even the Mississippi Indians of pre-Columbian Illinois, simply dream the same dreams and envision the same structures?
Scientist and tenured university professor Robert M. Schoch-one of the world's preeminent geologists in recasting the date of the Great Sphinx-believes otherwise. In this dramatic and meticulously reasoned book, Schoch, like anthropologist Thor Heyerdahl in his classic Kon-Tiki, argues that ancient cultures traveled great distances by sea. Indeed, he believes that primeval sailors traveled from the Eastern continent, primarily Southeast Asia, and spread the idea of pyramids across the Earth, involving the human species in a far greater degree of contact and exchange than experts have previously thought possible.
Voyages of the Pyramid Builders features sixteen pages of color photos and a special appendix, "Redating the Great Sphinx of Giza," in which Schoch provides his most up-to-date evidence of the Sphinx's older origins.