Interesting comparison point here from Australia.
There is a so called 'Bridge-Climb' in Sydney where you can walk over the arches/superstructure of the Sydney Harbour Bridge - which would be pretty fantastic.
I have never done this for a few reasons:
- It is super expensive - hundreds of dollars
- The walk over the regular footpath at street level is still pretty amazing .... and free

- To do the climb you are practically strip searched and metal detected before you go - No phones and cameras allowed - No backpacks, nothing in pockets etc etc .....And you have to wear these one piece jump suits - I never fancied any of these intrusions into my person! But the reason apparently is to prevent the above situation!
And as an FYI for more details - You are on a walkway - and also clipped into a cable the whole way!!