South America’s least visited country is landlocked and poor and has no transatlantic flights from its capital Asunción. It’s baking hot much of the year and its geography is harsh, with few paved roads leading into the interior. For the moment, fascinating regions such as the wildlife-rich wetlands of the Paraguayan Pantanal and the immense Gran Chaco, beloved of birdwatchers, will attract only those with plenty of time and patience and the desire to go somewhere really different.