Seeing somebody here cracked the elusive secret of Machu Picchu, I may as well ask for help on the other achievement: going over the Niagara Falls.
The most obvious hint shows up when passing through Duluth, where Passepartout suggests sailing across the Great Lakes but is turned down by Fogg because of 'ice'. Any idea on how to unlock the route?
Thank you for the tip, but isn't there some other condition to this thing than just to be aboard the Floating Village? (E. g. a character type or something.) Because I thoroughly inspected the conversation branches when travelling with the Kahwoka Othunwe and I found no option to steal a gyrocopter.
You can find some in Bucharest in seed II, Istanbul in seed IV and Madras in seed VII.
I explored the route map on Steam guide,and Duluth can't be reached no way,even with some adventure,item or character.So Duluth isn't your destination if you want to visit the Niagara falls.
As this thread is the first search result for the "80 days niagara falls" keywords, I thought it would be wise to clarify exactly what you need to do to go over the Falls in the game.
It's all in here: http://80days.wikia.com/wiki/Kahwoka_Othunwe
It's not about whisky in your inventory,it's about the device and that you have to be judged guilty.I managed to do this by lying in the council.Then you have to try to escape and steal an airship.If you fail at piloting it,you will fall at Niagara Falls.
You can do it with the whiskey as well, but yeah, you don't have to. Lying and not having enough skill will do it as well. (Not YOU not being skillful enough, but Passepartout - see here: http://imgur.com/TR7aT3u. Skill is the vertical axis, style is horizontal.)