138 (t) Carsten Peter/National Geographic/Getty Images. 140 (t) G. Brad Lewis/The Image Bank. 141 (bg) Steve Satushek/Photographer’s Choice. 142 (bc, bl, br) Gary L. Rosenquist (May 18th, 1980). (tr) InterNetwork Media/PhotoDisc. 143 (cl) Jim Richardson/National Geographic Image Collection. (r) Mark Moffett/Minden Pictures. 144 (b) Philippe Bourseiller. 147 (b) Martin Gray/National Geographic Image Collection. 148 (t) David McNew/Getty Images. 150 (b) Otis Imboden/National Geographic Image Collection. (bg) NOAA/ZUMA/Corbis. 151 (c) Margo Silver/Reportage/Getty Images. 152 (b) Weatherstock/Peter Arnold, Inc. 152 (bl) Kay Blaschke/Getty Images. (tc) Juan Silva/The Image Bank/Getty Images. 154 (bc) Stacy Gold/National Geographic Image Collection. (mc) Joel Sartore/National Geographic Image Collection. (ml) Harold F. Pierce/Nasa. (mr) Karen Kasmauski/National Geographic Image Collection. (tl) Somos/Veer/Getty Images. (tr) Brian Drouin/National Geographic Image Collection. 156–157 (LesOp) Tom Fox/Dallas Morning News/Corbis. 159 (bg) NOAA/Zuma/Corbis. (br) NASA/Corbis. (c) Chris Jordan Photographic Arts. 160–161 (bg) Warren Faidley/Corbis. 162 (bg) Jerry Grayson/Helifilms Australia PTY Ltd/Getty Images. (c) Robert Polidori. 165 (bg) Marianna Day Massey/Zuma/Corbis. (c) Robert Polidori. 166 (b) The Tattoo. (c) Yellow Dog Productions/Taxi. (t) Ed Kashi/Corbis. 169 (b) Robyn Beck/AFP/Getty Images. 170 (c) AP Photo/Phil Coale. 172 (b) InterNetwork Media/PhotoDisc/Getty Images. (bg) Peter Dazelley/Stone/Getty Images. 173 (c) Reuters/Corbis. 174 (br) Getty Images/Westend61. (l) Lauren Nicole/Getty Images. (tr) Sheer Photo, Inc/Getty Images. 176 (bc) Ira Block/National Geographic Image Collection. (bl) PictureNet/Corbis. (mc) Todd Gipstein/National Geographic Image Collection. (ml) Karen Kasmauski/National Geographic Image Collection. (mr) Cultura/Corbis. (tc) Bruce Forster/Getty Images. (tl) Image Source/Corbis. (tr) Liz Garza Williams. 180 (bg) Ted Streshinsky/Corbis. 191 (b) Jim Zuckerman/Corbis. 193 (b) Winfield Parks/National Geographic Image Collection. 198 (c) Theo Allofs/Getty Images. 201 (c) Guy Crittenden/Getty Images. 203 (t) Tim Flach/Stone/Getty Images. (b) AP Photo/Tsunemi. 204 (b) Gary Nolton/Stone/Getty Images. 205 (c) Daniele Montella. 206 (b) TriStar Pictures/Courtesy Everett Collection. 207 (b) Getty Images/The Bridgeman Art Library. 208 (bc) Steve Winter/Ngd. (bl) Joel Sartore/National Geographic Image Collection. (mc) Richard Lewisohn/Digital Vision/Getty Images. (ml) Joel Sartore/National Geographic Image Collection. (mr) Bernd Klumpp/Getty Images. (tc) Sidney Hastings/National Geographic Image Collection. (tl) Milton Montenegro/Getty Images. (tr) Malcolm Fife/Getty Images. 220 (t) The Granger Collection, New York. 225 (b) Jan Hakan Dahlstrom/Photonica/Getty Images. 226 (b) John Kobal Foundation/Getty Images. 227 (bg) George B. Diebold/Corbis. 228 (b) Lisette Le Bon/SuperStock. 229 (b) Bettmann/Corbis. 230 (bc) Galen Rowell/Corbis. (bl) Corbis/Jupiterimages. (mc) The Print Collector/Heritage–Images/Imagestate. (ml) RFI/Corbis. (mr) Maria Stenzel/National Geographic Image Collection. (tc) James L. Stanfield/National Geographic Image Collection. (tl) Gregg Segal/Getty Images. (tr) Stephen St. John/National Geographic Image Collection. 232–233 (LesOp) John Kobal Foundation/Contributor/Hulton Archive. 234 (t) Bettmann/Corbis. 235 (r) Pictorial Press Ltd/Alamy. 236 (b) Everett Collection. 237 (br) 1943 Universal Pictures. (cl) 1943 Universal Pictures. (cm) 1943 Universal Pictures. (cr) 1943 Universal Pictures. 238 (b) TM and Copyright 20th Century Fox Film Corp. All rights reserved. Courtesy: Everett Collection. 239 (br) Courtesy of Sarah Karloff/Universal Licensing, LLC/U.S. Postal Service Licensing Group. Nelson/mn/AFP/Getty Images. (tr) Everett Collection. 244 (b) image100/SuperStock. 246 (b) Getty Images. 248 (b) Wayne Eastep/Photographer’s Choice/Getty Images. 249 (c) Joan Marcus Photography. 250 (b) Robbie Jack/Corbis. 251 (b) Joseph Sohm; Visions of America/Corbis. 252 (bc) Holos/Getty Images. (bl) Steve Raymer/National Geographic Image Collection. (mc) Barry Rosenthal/Getty Images. (ml) Keith Brofsky/Getty Images. (mr) Jonathan Daniel/Getty Images. (tc) Ronnie Kaufman/Corbis. (tl) Brand X Pictures/Jupiterimages. (tr) Emmanuel Faure/Getty Images. 257 (b) Everett Collection. 270 (c) Ingram Publishing (Superstock Limited)/Alamy Images. 277 (r) Michael Nichols/National Geographic Image Collection. 279 (b) Emory Kristof/National Geographic Image Collection. 280 (b) The Ulster Folk and Transport Museum/National Museums Northern Ireland. (bg) Emory Kristof/National Geographic Image Collection. 281 (tr) Paul Souders/Corbis. (b) The Mariner’s Museum/Corbis. 282 (b) M. Timothy O’Keefe/Alamy Images. 284 (bc) epa/Corbis. (bl) Don Hammond/Design Pics/Corbis. (mc) Pixland/Corbis. (ml) Tom Grill/Corbis. (mr) Ned Frisk Photography/Brand X/Corbis. (tc) George Disario/Corbis. (tl) Michael Blann/Getty Images. (tr) Moodboard/Corbis. 286–287 (bg) Emory Kristof. 287 (c) Mystic Aquarium & Institute for Exploration. 288 (l) Corbis Sygma. 288–289 (r) Hulton Archive. 290 (b) Illustration by Ken Marschall 1992 from Titanic: An Illustrated History, a Hyperion/Madison Press Book. 291 (b) Topical Press Agency/Stringer/Hulton archive. 292 (b) Photograph by Bert Fox National Geographic Society. 293 (b) Institute for Exploration/Institute for Archaeological Oceanography. (t) Mystic Aquarium & Institute for Exploration. 294 (b) Bruce Dale. (t) Priit Vesilind. 297 (b) Institute for Exploration/University of Rhode Island. 298 (b) Odilon Dimier/Getty Images. 301 (c) PhotoDisc/Alamy Images. 302 (r) Somos Images/Corbis. 303 (b) Dana White/PhotoEdit. 304 (bc) O. Louis Mazzatenta/National Geographic Image Collection. (bl) Adam Jones/Getty Images. (mc) Angelo Cavalli/Getty Images. (ml) David Cattanach/Alamy. (mr) Oppenheim Bernhard/Getty Images. (tc) AP Photo/Marco Ugarte. (tl) Martin Child/Getty Images. (tr) AP Photo/Hassan Jamali. 315 (b) Annie Tiberio Cameron/DC Artists Management. 322 (b) Adrian Sherratt/Alamy Images. 323 (t) Sisse Brimberg/National Geographic Image Collection. (b) image100/Corbis. 324 (b) Danita Delimont/Alamy Images. 326 (bc) David Muir/Getty Images. (bl) Ed Taylor/Getty Images. (mc) Frans Lemmens/Getty Images. (ml) Shannon Fagan/Getty Images. (mr) AP Photo/Mike Derer. (tc) Kaz Chiba/Getty Images. (tl) Mark Scott/Getty Images. (tr) Michele Constantini/Getty Images. 328–329 (LesOp) Planet Art: Ancient Egypt. 329 (c) AP Images. 330–331 (bg) Bridgeman Art Library. 331 (r) Paul Hardy/Corbis. 332–333 (bg) Kenneth Garrett/National Geographic Image Collection. 333 (c) Erich Lessing/Art Resource NY. (r) Louvre Paris, France/Bridgeman Art Library. 334 (t) Bettmann/Corbis. 334–335 (b) Kenneth Garrett/National Geographic Image Collection. 337 (b) Roger Viollet, Paris/Bridgeman Art Library. (t) Ron Watts/Corbis. 338 (bg) Egyptian National Museum, Cairo Egypt/Giraudon/Bridgeman Art Library. 339 (b) Bridgeman Art Library. 339 (t) The Granger Collection, NY. 340 (b) Sandro Vannini/Corbis. (t) Copyright Griffith Institute, Oxford. 344 (b) Bridgeman Art Library. 351 (t) Hulton Archive/Getty Images. (b) Hulton Archive/Getty Images. 353 (t) Albert Normandin/Masterfile/www.masterfile.com. (b) Adalberto Rios Szalay/Sexto Sol/Getty Images. 354 (b) Hulton Archive/Getty Images. (bg) Masterfile (Royalty-Free Div.) www.masterfile.com. 355 (c) Michael Newman/PhotoEdit. 356 (c) Hulton Archive/Getty Images. 358 (bc) Michael Melford/National Geographic Image Collection. (bl) Corbis. (mc) Brian Drouin/National Geographic Image Collection. (ml) Karan Kapoor/Riser/Getty Images. (mr) Corbis. (tc) Joyce & Frank Burek/Animals Animals. (tl) Dynamic Graphics/Creatas Images/Jupiterimages. (tr) Spencer Platt/Getty Images. 360–361 (t) Comstock. 362 (c) C Squared Studios/Photodisc. 363 (b) Bettmann/Corbis. (t) Henry P. Moore/The New York Historical Society. 364 (l) The Ohio Historical Society Archives Library. 365 (r) Levi Coffin House. 368 (bg) 2007 Masterfile Corporation. (t) Dave King/Dorling Kindersley. 371 (b) National Geographic/Getty Images. 372 (b) Astrofoto/Peter Arnold, Inc. 374 (b) Angelo Cavalli/Digital Vision/Getty Images. (bg) ACE STOCK LIMITED/Alamy Images. 375 (t) Dave G. Houser/Corbis. (b) Bertrand Gardel/hemis.fr/Getty Images. 376 (b) John Miller/Robert Harding World Imagery/Getty Images. 377 (t) AFP/Getty Images. 378 (bc) Carsten Peter/National Geographic Image Collection. (bl) John Gurzinski/AFP/Getty Images. (mc) Cindy Karp/Time Life Pictures/Getty Images. (ml) ML Harris/Getty Images. (mr) Mark Reinsti/Index Stock Imagery/Jupiterimages. (tc) Stephen St. John/National Geographic Image Collection. (tl) Scott Sroka/National Geographic Image Collection. (tr) Victor Mikhailovich Vasnetsov/Bridgeman Art Library/Getty. 390 (bg) Ric Ergenbright/Corbis. (t) David Bartolomi. 393 (b) AP Images/John Riley. 394 (c) Time & Life Pictures/Getty Images. 396 (b) Arif Ali/AFP/Getty Images.(bg) Charlie Drevstam/Johner Images Royalty-Free/Getty Images. 397 (c) AFP/AFP/Getty Images. 398 (b) AFP/Getty Images. 400 (bc) H. Edward Kim/National Geographic Image Collection. (bl) Lars Klove Photo Service/Getty Images. (mc) Michael Siluk/Photo Library. (ml) Antonio Mo/Taxi/Getty Images. (mr) Simon Marcus/Corbis. (tc) Lyndon Beddoe/Alamy. (tl) AP Photo/Ron Edmonds. (tr) Digital Vision/Getty Images. 402–403 (LesOp) Mitchell Funk/The Image Bank. 404 (b) Joseph Sohm/Visions of America/Corbis. 405 (b) Steve Raymer/Corbis. (c) Bob Daemmrich/PhotoEdit. (t) David Young–Wolff/PhotoEdit. 406 (l) Michael Schwarz. (r) Press Association Incorporated.