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 Sahara desert expands at about 1km per month.
90
Australia's Great Barrier Reef is 1,250 miles long!
45
More than 25% of the world's forests are in Siberia.
51
The state with the longest coastline in the Continental U.S. is Michigan.
31