Nature 306

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This strenuous construction process meant that workers only cleared inches a day; it took two and a half years to bore through the nearly 1,700ft-long tunnel at Donner Summit. Look closely, Hsu said, and "you can still see the drill marks".

An international tribunal was formed in 1903 to solve the Alaska Boundary Dispute. Made up of six impartial jurists from the US, Canada and England, the group ended up setting Alaska’s eastern boundary 56km east of where the ocean touched the mainland coast.