The bus ride out of Coroico was unsettling.  I snapped several dozen pictures out of the bus window in an attempt to capture the proximity of the bus to the cliff's edge and the sheerness of the drop.  Unsurprisingly, these pictures sucked.  However, this one does a reasonable job of showing one of the many eroded washouts that took car-sized bites out of the road.  The river is far, far below.