The city of Houston, Texas is built on a swamp and is slowly sinking!
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More than 25% of the world's forests are in Siberia.
51
A waterfall known as The Devil's Kettle empties water into a hole and nobody knows where it ends up!
18
Due to gravitational effects, you weigh slightly less when the moon is directly overhead.
55
The water between India and Sri Lanka is only 3-30 feet deep and was purportedly passable on foot until 1480 AD when a cyclone moved some sand around.
1
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63