USA/California
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Loads of countries have Lego Lands in them, but parks aren't entirely made out of Lego.
Denmark
Denmark
There are no parks that are made all out of Lego's but there are 3 Lego lands, in Denmark, California, and Florida, there are also multiple Lego discovery centers.
Antarctica
yes
The Original is in Denmark there are also ones in California and Florida
July 1st 1910
It was opened April 20, 1912.
The park was constructed in the 1960s on the estate of the former governor of Tennessee, Henry Horton.