3

John Smith

3

John Cabot

4

The Space Needle

4

Maddy's Virginia Diary

4

The American Revolution

4

Gorillas and Other Primates

4

Maddy's Texas Diary

3

Famous Explorers

4

Grand Canyon

4

America in the 20th Century

4

Maddy's Washington, D.C. Diary

4

After the American Civil War

4

Things to Do in Central Park

4

Maddy's North Carolina Diary

4

Chip's Tips on Botswana

4

Yellowstone National Park

4

Maddy's Colorado Diary

4

Buckingham Palace, London

4

Maddy's Maryland Diary

4

The Tower Bridge, London

4

Belém Tower, Portugal

4

Chip's Tips on Canada

3

Daniel Boone

4

Maddy's Florida Diary

3

Edmund Hillary

4

Maddy's Tennessee Diary

4

Chip's Tips on Papua New Guinea

4

Maddy's Oregon Diary

3

Space Exploration

3

Vasco da Gama