The Sahara desert expands at about 1km per month.
90
Venice Island was built on a foundation of tree trunks. 1200 years later, those same trunks still support almost all of central Venice.
8
It's still possible to see the division between East and West Germany due to different light bulbs.
5
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
The Caspian Sea is also classed as the world's largest lake.
52
Australia's Great Barrier Reef is 1,250 miles long!
45
Every year, Alaska has about 5,000 earthquakes.
31
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