Why have bodies been found in the bogs of northern Europe?

Thousands of years ago, the early people of Europe thought that bogs were places where they could communicate with gods and goddesses as well as dead relatives. 

They made offerings in the bogs, to please the gods or perhaps to ask for something. Cauldrons, jewelry, and even wagons were deposited in the bogs to curry special favor. 

Sometimes people were sacrificed in or near the bogs and buried there, as the ultimate offering.