Mysteries of mankind : Earth's unexplained landmarks / prepared by the Book Division, National Geographic Society. - Washington, D.C. : The Society, c1992. - 200 p. : col. ill. ; 26 cm.

Includes bibliographical references (p. 197) and index.

ISBN: 0870448641

LCCN: 92022242

Subjects--Topical Terms:
Megalithic monuments.
Earthworks (Archaeology)
Sacred space.

LC Class. No.: GN790 / .M97 1992

Dewey Class. No.: 930