That's because the suspension bridge hangs 175 metres above the ground. Seriously, it's not one for those who don't like heights.
There's that, but also the fact that the floor of the bridge is made from metal grating so you can see the ground all that way beneath you.
However, if that seems like something that appeals to you, you can just head on over to the 516 Arouca Bridge near to Porto in the Iberian nation.
To be fair, if you've got the stones to actually go across it, the views will be a fine reward for your bravery.
If you're wondering why it's called the 516 Arouca bridge, that's because it's 516 metres long, and straddles the gorge that is near the town of Arouca.
It is thought to be the world's longest bridge of this kind, and it'll take you about 10 minutes to cross.
Well, that's the idea. If you're terrified of heights it could take either 10 seconds or 10 hours, depending on which way you go.
It spans a river, and features spectacular views of the gorge and a lovely waterfall, and you'll be able to see all of this through your legs if you look down.
Again, that's if you can do so without vomiting.
The architects of the bridge - which will open this month - describe it as a 'pure Tibet-style footbridge with no towers and a sagging deck with a more conventional tower supported span with a flat deck'.
From start to finish, the bridge has taken around three years to finish, and - in the end - it's a pretty impressive feat of engineering.
So, if you find yourself in the area, you could do worse than checking which of your travelling buddies is up to the task.
Be warned, not only is it scary, the plan is that you'll have to pay for the privilege of crossing over the Paiva gorge in this fashion.
They've not actually agreed on a toll yet, but it'll be a small price to pay for the uninterrupted views of the countryside, and the sound of people heaving over the side will only serve to enhance the experience.
Just kidding, you'll have a lovely time really.
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