When people talk about Thailand, they mean Bangkok. Nobody even mentions the serene and beautiful places like Koh Samui, Phuket, Chiang Mai, Phi Phi Island etc. Chiang Mai is a place every solo traveler must visit. It is an ancient Buddhist city and still has the Moat and the defensive walls which were built around 13th century.
8. Morocco
Morroco has unique attractions for its travelers. Caravans with camels are used to cross the great Sahara. As a solo traveler, you can even plan to visit Malabata Coast which is in Tangier. It was once home to the great Hercules.