Visit Niagra Falls
Ticked off in December 2014
What it is
Niagara Falls is made up of three waterfalls on the US–Canada border, with Horseshoe Falls the largest.
How to do it
Visit from either side, take the Maid of the Mist or Hornblower boat, and walk behind the falls on the Canadian side.
Top tip
Bring your passport if you want to cross the Rainbow Bridge.
My experience
Ticked off, but the full story is still to be written up.