Mexico City is built on top of an underground resevoir!
47
Venice Island was built on a foundation of tree trunks. 1200 years later, those same trunks still support almost all of central Venice.
8
The state with the longest coastline in the Continental U.S. is Michigan.
31
Every person in the world can fit in Texas and be given over 1000 sq ft in which to live.
14
Australia's Great Barrier Reef is 1,250 miles long!
45
More than 25% of the world's forests are in Siberia.
51
Forest fires move faster uphill than downhill.
52
If Antarctica's ice sheets melted, the worlds oceans would rise by 60 to 65 metres (200 - 210ft) - everywhere
181