4

Yellowstone National Park

4

Serengeti, Tanzania

4

Mount Rushmore

3

Canyons of the World

4

Maddy's Virginia Diary

3

Fjords of the World

4

Table Mountain, South Africa

3

Sinkholes of the World

4

Maddy's California Diary

4

Chip's Tips on Zambia

4

Mount Fuji, Japan

4

Maddy's Wyoming Diary

4

Chip's Tips on Kenya

4

Chip's Tips on Ghana

4

Maddy's Colorado Diary

4

Maddy's Kentucky Diary

4

Maddy's North Dakota Diary

4

Maddy's Oregon Diary

4

Maddy's Pennsylvania Diary

4

Chip's Tips on Honduras

4

Grand Canyon

4

Maddy's Tennessee Diary

4

Maddy's Montana Diary

4

Chip's Tips on Venezuela

4

Maddy's Utah Diary

3

Wetlands of the World

4

Maddy's Washington Diary

4

Chip's Tips on Botswana

4

Maddy's Ohio Diary

4

Chip's Tips on Chile