Montezuma Cypress.
Sixth-grade children from the Colegio Montolinia de Antequera line up in front of a Montezuma cypress known as el Arbol del Tule. The trunk, 119 feet in circumference and roughly 38 feet in diameter, supports a crown the size of almost 2 tennis courts. In the 1990's the Mexican governement re-routed the Pan-American Highway an approved a grant to dig a well for the tree to mitigate damage caused by car exhaust and a falling water table.
Here are two pictures of the tree; the tree is so wide I could not get a wide enough picture on my scanner, so you need to imagine the two pictures together forming one.