Lesotho is a great place to stop in when you’re visit South Africa, because this country completely surrounds the small country of Lesotho. It is one of three countries that are entirely surround by only one other country, the other two are San Marino and the Vatican, both in Italy.
You can enter the country via the Drakensberg escarpment, and it’s worth it just for the landscapes. And of course you can add another country to your lists. The entire country is remarkably mountainous, perfect for a hiking for example.