Where are secret places in Call of Duty 4 Modern Warfare?

In Call of Duty 4: Modern Warfare, secret places include various hidden areas and Easter eggs throughout the campaign and multiplayer maps. For instance, in the mission "All Ghillied Up," players can explore the rooftops and hidden pathways in Pripyat. In multiplayer, maps like "Crash" and "Vacant" feature locations such as the rooftops and interior spaces that can provide tactical advantages. Players can also find hidden weapons and intel items throughout the game, encouraging exploration.