Band-e Amir is one of the rare natural lakes in the world which are created by travertine systems. The site of Band-e Amir has been described as Afghanistan's Grand Canyon, and draws thousands of tourists a year.
Matera is an atmospheric town in southern Italy; a UNESCO site. Matera has gained international fame for its ancient town, the "Sassi di Matera" (meaning "stones of Matera"). Tricky to reach, but well worth making the effort for a memorable trip.