4

Brandenburg Gate, Germany

3

Meteorites, Meteoroids, and Meteors

4

Chip's Tips on Rwanda

4

U.S.S. Arizona Memorial at Pearl Harbor

3

Rivers of the World

3

Anne Frank

3

Pablo Picasso

4

Sheikh Zayed Mosque, UAE

3

Heat and Temperature

3

Florence Nightingale

3

May Day

3

Hanukkah

3

Ludwig van Beethoven

4

Chip's Tips on Switzerland

3

Martin Luther

2

Country Flags of Europe

4

Nasir al-Mulk Mosque, Iran