stairs, ladders, tunnels, bridges, basements, roofs etc. etc. all have an ability to draw me in.
It’s is also the metaphorical nature of these places & things that also interest me.
i.e. the term ‘over the top’ was first phrased in the first world war. (going over the top of the trench to fight the enemy) which often would result in death.

over pass

underpass

trainpass