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The lush, green canopy that is Bialowieza Forest spans 350,000 acres between Poland and Belarus. It's a UNESCO World Heritage Site that is home to a variety of endangered species like the European bison, which is slightly larger and leaner than its American cousin.

It also has some of the last old-growth forest in Europe, untouched by human hands, and there is a great deal of international interest in preserving the forest's delicate ecology.

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While the G-20 leaders were working on their official agreement at the summit which was heavily guarded, demonstrators marched through the streets of Hamburg. This was the largest of three days of protests.

(SOUNDBITE OF PROTESTERS CHANTING)

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