3

John Cabot

3

John Smith

3

Vasco da Gama

3

Space Exploration

3

Astronauts

4

Maddy's Florida Diary

4

Maddy's Maine Diary

4

Maddy's Washington, D.C. Diary

3

Daniel Boone

3

Edmund Hillary

4

Buckingham Palace, London

4

Maddy's North Carolina Diary

4

Chip's Tips on Canada

4

Yellowstone National Park

4

Chip's Tips on Botswana

3

Famous Explorers

4

Maddy's Virginia Diary

4

Maddy's Colorado Diary

4

After the American Civil War

4

Maddy's Texas Diary

1

Jan and Jim

3

Famous Explorers

4

The American Revolution

4

Gorillas and Other Primates

4

Grand Canyon

4

Belém Tower, Portugal

4

Maddy's Oregon Diary

4

Chip's Tips on Papua New Guinea

4

The Space Needle

4

The Tower Bridge, London