The Tree of Life is one of the most known of the Sacred Geometry Symbols. The structure is connected to the sacred teachings of the Jewish Kabbalah and as far back as 3,000 years in Egypt. It is possible to see the Tree of Life structure in many places around the known universe.

In Jewish, Christian & Muslims mythology, Serpents trees and fruit are important symbols. A tree sits in the center of both the Heaven and Earth. It should be noted that the Tree of Life and the Tree of Knowledge are not the same (Genesis 2.9).

Tree of Life symbols are also found in the stories about ancient Scandinavian and Germanic history, Norse saga of the ash tree Yggdrasil, where the tree provides a magical spring water of knowledge. The Norse cosmic World Ash, Ygdrassil, has its roots in the underground while its branches are supporting the Gods. 

 
To the Mayas, it is Yaxche, whose branches support the heavens. It represents the axis mundi, the stable world center. It constitutes a symbolic vertical line like the line of balance on a spinning top that unites the three realms of underworld, earth, and heavens.

In China the Tree of Life depicts a bird and a dragon - in Chinese mythology, the dragon often represents immortality.
Disney has A Tree of life in its animal Park. The tree is 14 stories high and 50 ft wide. It’s really something to see 325 animals are carved into its may branches.

There is even an ongoing web project going on called The Tree of Life Web Project. With its biologists from all around the world they provide information about organisms on Earth.

The Egyptian's Holy Sycamore stood on the threshold of life and death, connecting the worlds. In ancient Egypt, the direction east was considered the direction of life, since the sun rose in the east. West was considered the direction of death, entering the underworld, because the sun set in the west. They believed that during the night, the sun traveled through the underworld to make its way back to the east to rise again in the east the next day. 

There have even been some crop circle formations that look like Tree of Life signs. One appeared at Barbury Castle in May 1997. The formation was the Kabalistic Tree of Life. I’m not sure what this means but it is strange.

You can find tree of life pottery, necklaces, rings, pendants, cross, wall hangings. There are many different items you can purchase to represent the tree of life.  There are many good books that relate to The tree of life.