It is a tree, our guide said it was fig tree of some type - not sure if that's true but until someone tells me otherwise I have no reason to doubt him. I suspect there was some type of natural opening that was enlarged to accommodate the road.
Common names can be so misleading as you know. Take cedar trees for example. There is the western red cedar, the northern white cedar, the eastern red cedar, the cedars of Lebanon, the blue Allas cedars, the Deodar cedars, the cedros (cedars) of the tropics. Of all the cedars I just mentioned 4 genera are involved. In most cases they only remotely resemble each other. .....When your guide says "fig" tree, does he mean people have taken o sown figs all around it? Produces smelly figs? When i hear "fig" tree I think of the genus Ficus, which has smooth bark. The bark in the picture looks rough. Who knows? Just be careful with common names.
Just one more follow up and I'll get off my soap box, thanks for indulging me with this space.....One would think in North America, a 1st world continent, that this problem would be minimal. Not the case. From the sounds of it, western red cedar and eastern red cedar would share a high degree of botanical commonality. Wrong. An elementary student could tell them apart easily. Western red cedar is Thuja plicata and eastern red cedar is Juniperus virginiana, quite distinct the two. OK, I'm done!
I failed to blow it up full size at first and impulsivley went on my little rant. Sorry. It does indeed look like a fig. Hope the readers can still garner something of value from me venting about a pet peevey of mine.