4

How they work? Ships

4

Chip's Tips on Malta

3

Leonardo da Vinci

4

Things to See in New York City

2

Country Flags of Europe

3

Straits of the World

3

Florence Nightingale

4

U.S.S. Arizona Memorial at Pearl Harbor

3

Easter

3

Christopher Columbus

4

Chip's Tips on Switzerland

3

Cuisines of the World

3

Marco Polo

3

Napoleon Bonaparte

3

Caves of the World

4

Chip's Tips on Greece