4

Yellowstone National Park

4

Maddy's North Dakota Diary

4

Maddy's Montana Diary

4

Chip's Tips on Zambia

4

Maddy's Oregon Diary

4

Maddy's North Carolina Diary

4

Mount Fuji, Japan

4

Maddy's Washington Diary

4

Grand Canyon

4

Maddy's Wyoming Diary

3

Sinkholes of the World

3

Wetlands of the World

4

Serengeti, Tanzania

3

Canyons of the World

4

Maddy's Arkansas Diary

4

Maddy's California Diary

4

Maddy's Kentucky Diary

4

Maddy's Tennessee Diary

3

Valleys of the World

4

Maddy's Pennsylvania Diary

4

Maddy's Alaska Diary

4

Maddy's Virginia Diary

4

Chip's Tips on Botswana

4

Bazaruto Archipelago, Mozambique

4

Maddy's Colorado Diary

4

Maddy's Idaho Diary

4

Chip's Tips on Chile

4

Mount Rushmore

4

Maddy's Arizona Diary

4

Chip's Tips on Honduras