Chaniga Taumjun, 12, takes a break at a botanic garden in Ayutthaya, the former capital of Thailand.

Thailand is often called the "land of smiles", not only because of its natural beauty and historical riches, but also because of its friendly people and fascinating culture. Smiling is so ubiquitous here, it is practically contagious. According to some medical experts, smiling relieves stress and boosts the immune system.