bhutan measures its success with a gross national happiness index instead of using gdp .
the buddhist country is a land of myths and magic , where tigers fly and witches reside in ancient forests .
houses are decorated with dragons , animals and phallic symbols to guard against malicious thoughts .
buddhist monuments , known as stupas , are erected near rivers to defy the evil spirits that lurk beneath the water .
massive dzongs , medieval monastic fortresses , tower over the valleys decorated with prayer flags .