Nat Geo: World of Secrets is a Facebook based social game, hidden object game, that allow you to explore locations all across the globe, free to play on Facebook, from 6Waves.
" From your home base at the National Geographic Society in Washington D.C., you will travel to seven distinct locations—ranging from the Pyramids of Egypt to the Yucatan Peninsula—and play through 27 hidden object scenes with a variety of play modes and helpful hint functions. Players can engage in over 160 quests as they help solve mysteries and pick up locationspecific artifacts along the way. Artifacts can also be used to create custom museum exhibits that the player can show off to their friends! Additional social elements of the game include the ability to visit friends’ exhibits, gift/receive rare artifacts, bragging abilities, and more. "