4
Hadrian's Wall, England
4
Chip's Tips on Egypt
3
May Day
4
Buckingham Palace, London
4
The Mississippi River
3
Purim
4
Chip's Tips on Chile
3
Hanukkah
3
Force
4
Carthage, Tunisia
4
Okavango Delta, Botswana
3
Eid al-Fitr
4
Chip's Tips on Algeria
3
Passover
4
Chip's Tips on Cameroon
4
Chip's Tips on Canada
4
The Willis Tower
4
Bazaruto Archipelago, Mozambique
3
Mardi Gras
4
Hoover Dam
4
Chip's Tips on Australia
4
Serengeti, Tanzania
4
Grandpa's Guide Dog
3
Heat and Temperature
4
Niagara Falls
4
Chip's Tips on Papua New Guinea
4
London Eye, London
3
Motion
4
Chip's Tips on Thailand
3
Speed, Velocity, and Acceleration