Vajra asana

In Buddhism Vajrasana means ‘Diamond Throne’ and marks the spot where the Buddha gained Enlightenment.

"Bodh Gaya is the place where Gautama Buddha attained unsurpassed, supreme Enlightenment. It is a place which should be visited or seen by a person of devotion and which would cause awareness and apprehension of the nature of impermanence".

Siddhartha Gautama, the Buddha-to-be, had been dwelling on the banks of the Nairanjana River with five ascetic followers for six years practicing austerities. Realising that austerities could not lead to realisation he abandoned them. His five ascetic companions disgusted at his seeming failure, deserted him and left for Sarnath.

He then moved towards the village of Senani where he was offered rice milk by a Brahmin girl, Sujata. Accepting from a grass-cutter a gift of kusa grass for a mat, the Bodhisattva took a seat under a pipal tree facing east. Here he resolved not to rise again until enlightenment was attained.

Here on this seat my body may shrivel up,
my skin, my bones, my flesh may dissolve,
but my body will not move from this seat
until I have attained Enlightenment,
so difficult to obtain in the course of many kalpas".

As Gautama sat in deep meditation, Mara, Lord of Illusion, perceiving that his power was about to be broken, rushed to distract him from his purpose. The Bodhisattva touched the earth, calling it to bear witness the countless lifetimes of virtue that had led him to this place of enlightenment. When the earth shook, confirming the truth of Gautama's words, Mara unleashed his army of demons. In the epic battle that ensued, Gautama's wisdom broke through the illusions and the power of his compassion transformed the demons' weapons into flowers and Mara and all his forces fled in disarray.

Source

https://www.buddhanet.net/e-learning/buddhistworld/bodgaya.htm