4

The Tower Bridge, London

4

The Golden Gate Bridge

2

Building Bridges

3

Harbors of the World

4

London Eye, London

4

Victoria Falls, Zimbabwe/Zambia

3

Engineer

3

Isthmuses of the World

3

Vasco da Gama

4

Chip's Tips on United States

4

Chip's Tips on Australia

3

Bays of the World

3

Charles Darwin

3

Helen Keller

4

Maddy's Missouri Diary

3

Houses from around the World

4

Chip's Tips on Canada

4

Maddy's Massachusetts Diary

3

Isaac Newton

4

Things to See in New York City

3

Construction Worker

4

Maddy's Kentucky Diary

4

Hoover Dam

3

Motion

4

Maddy's Kansas Diary

4

Petronas Twin Towers, Malaysia

4

Maddy's West Virginia Diary

3

Florence Nightingale

4

Chip's Tips on Nigeria

4

Landmarks of the United States