Sarv-e Abar-Kuh ("cypress of Abar-Kuh"), also called the Zoroastrian Sarv, is a Cupressus sempervirens tree in Abarkuh, yazd, Iran. It is protected by the Cultural Heritage Organization of Iran as a national natural monument and is indeed a major tourist attraction with a height of 25 metres and circumference of 18 metres.
It is estimated to be over 4000 years old and may be the oldest living thing in Asia. According to the China Daily ranking of the top 10 oldest trees in the world, Sarv-e Abar-Kuh is the second oldest tree in the world.
Reference:
http://en.wikipedia.org/wiki/Sarv-e_Abarkuh