100 years

and never an accident

The mechanics of the Aero Car have been modernized, but the actual Aero Car itself is the one and only from 100 years ago. We can thank Spanish engineer Leonardo Torres-Quevedo for this wonder. (for this reason, it is also called the Spanish Aero Car, though the name was officially changed by the Niagara Parks Commission to the Whirlpool Aero Car in 2004. Mostly, it is just known as the Aero Car) The car is suspended via six cables – three on the left and three on the right. Twenty-four wheels keep the car moving from point A to point B. You do nip in and out of the US, but because you're suspended in the air while border crossing, and both end points are in Canada, you don't need a passport. 

It has been designated an International Historic Civil Engineering Work.
And, no, I have never been on it.