The Dallas/Ft. Worth airport is larger than New York City's Manhattan Island.
62
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
Venice Island was built on a foundation of tree trunks. 1200 years later, those same trunks still support almost all of central Venice.
8
A waterfall known as The Devil's Kettle empties water into a hole and nobody knows where it ends up!
18
Every year, Alaska has about 5,000 earthquakes.
31
One cubic mile of seawater contains about 50 pounds of gold.
79
A volcano has enough power to shoot ash as high as 50 km into the atmosphere.
59
It's still possible to see the division between East and West Germany due to different light bulbs.
5