It spread Anglo-European culture across the nation and caused trade to flourish, but the story of the Chinese labourers who built the track has largely been forgotten.
A polarising ingredient in much of the world, coriander is an unsung hero of Indian cuisine. And one chef wants to bring it into the limelight, giving it "the glory it deserves".
Did Vikings find their way to a remote part of Oklahoma? Some in a small community believe so, thanks to controversial runic carvings found in the area.