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About half a million mice live in the London Underground.
In Oregon, there’s an underground mushroom that covers 2200 acres (880 hectares).
KitKats’ year production could stretch around the London Underground more than 350 times.
The world’s first underground park will be inaugurated in 2018 in New York.
Burning Mountain, Australia, has an underground natural coal fire that has been burning for about 6,000 years.
Despite its name, more than half of the London’s Underground network in fact runs above ground.
The London Underground was originally intended to terminate in Paris.
Every week, London Underground escalators travel the equivalent of twice around the world.
In Coober Pedy, Australia, over half of the population lives in caves carved underground to stay away from the heat.
There is an underground vault in Denmark containing every Lego set ever.
In Beijing, one million people live underground in basements and air raid shelters.
60% of the construction done at Machu Picchu was underground.
According to research by University College, London, such is the concentration of dust particles, that travelling on London’s Underground for 40 minutes is the equivalent to smoking two cigarettes.
The London Underground trains were originally steam powered.
There’s an underground river 4 KM (2.4 mi) beneath the Amazon River in Brazil, that might be as long, but hundreds of times wider.
Wolves have only one breeding season per year – in the winter. They have their puppies in late April or early May. They have their puppies in an underground hole, or den. There are usually four to six puppies in a litter. The puppies grow up fast and are their adult size by the end of their first winter. They are grown up by the time they are two years old.