Mammoth Tree House

halcyon days of our youth where a few 2x4s pounded into an old elm with rusty nails constituted the coolest tree house
on the block are not just long dead, but now embarrassingly overshadowed by the richest kid on the street, Lord
Northumberland, and his World’s Largest
tree house

Located on the grounds of Alnwick Gardens just 95 miles south
of Edinburgh (and next to the Alnwick Castle, the very one
used in the Harry Potter films), this 6,000-square-foot tree house leviathan soars 56 feet
above the ground and is connected with 4,000-square-feet of suspended walkways.  It has a restaurant that seats
120 people as well as classrooms, cafes, turrets, wobbly bridges, and imported wood from all over the world.

Oh, and it cost $7 million. 

Boy, I sure do miss the simple days of my youth.