El Drago Milenario

Billet 1000 Pesetas Recto Galdos

The specimen's age is disputed. It is thought to be around 800–1,000 years old.[1] Alexander von Humboldt estimated a similar tree on the island (that fell in a storm in 1867) to be several thousand years old, and a 1907 estimate by professors and students of the Polytechnic School of Zurich put it at 2,500 years old,[2] but an upper limit of 350 years was placed on it in 1975 by Mägdefrau,[3] while other studies suggest that it is around 1,000 years old.[2]

It was declared a national monument in 1917.[1] In the 1930s, part of the base was closed with stones and cement. In 1985 it was studied by arboriculturist Kenneth Alien, who reopened the entrance and installed a large fan inside the trunk cavity to aid air circulation and prevent fungal growth. In 1993 the road that passed within a few metres of the tree was rerouted.[4] Since 2002 it has been considered for submission to UNESCO as a World Heritage Site candidate.[1][5]

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