World Biggest,Smallest,Tallest and Longest

World Biggest: 

1. Ocean: Pacific Ocean
2. River: Amazon (South Africa)
3. Island:Greenland(Denmark)
4. Desert:Sahara (Africa)
5. Lake:Caspian Sea (Russia)
6. Building: Pentagon
7. Museum:British Museum(London,UK)
8. Bridge:Aukland(Sanfrancisco)
9. Pyramid:Great Pyrmid of Egypt
10. Airport:King Adbul AJiz (Saudi Arab)
11. University:Indira Gandhi National Open University (New Delhi, India)
12. Flag: Great American Flag
13. Bird: Ostrich
14. Land Animal: Elephant
15. School:South Point High School, (Calcutta)
16. Clock: Bigbell, London
17. Railway Station:Grand Central Terminal(New York)

World Smallest:

1. Country: Vatican City
2. Continent: Australia
3. Bird: Bee Humming Bird
4. Tree: Tundra

World Tallest: 

1. Mountain: Sagarmatha (8848m,Nepal)
2. Plateu:Pamir (Tibet)
3. Hotel in Highest altitude:Everest View
4. Capital in highest altitude:Lapaz (Bolivia)
5. City in higest altitude:Lhasa
6. Building:Burz Khalifa(160 Storeyed and 818m)

World Longest:

1. River: Nile
2. Canal:Volga Baltik Canal
3. Railway Line:Trans Siberian Railway
4. Bridge:Dayang Kushung Grandbridge(China)