If you can describe a road surface as being home to a rock formation, you might be in Kinshasa, Congo.
Protrusions of solid rock extend several feet above the road surface, as though thrust upward by some geologic force. In fact, these shockingly large outcroppings are made possible through an unfortunate combination of poor construction, over-use, and extreme neglect. I came upon several such promontories during a recent visit to the Congolese capital. And these were not rural or back street rock climbing opportunities. These can be found on main roads across the city center.