Zambia/Zimbabwe: Mosi-oa-Tunya / Victoria Falls&quot;These are among the most spectacular waterfalls in the world. The 
Zambezi River, which is more than 2 km wide at this point, plunges 
noisily down a series of basalt gorges and raises an iridescent mist 
that can be seen more than 20 km away.&quot; — UNESCO Photo: JoSon, Getty Images / (c) joSon