What are some lesser known/interesting stories in Mahabharata?

After war of kurukshetra.

Whole country celebrated the coronation ceremony of yudhisthira.

After coronation ceremony, Krishna advised yudhisthira “Go and visit your granduncle, seek his blessings and let him share the knowledge and secret of peace”

Death is slowly coming towards bhisma. Bhisma said “give me some water first”

Arjuna immediately shot an arrow on earth and a fountain of water comes out. His thirst satisfied.Bhishma told Yudhishtira, ‘Life is like a river. You can struggle to change its course but ultimately it will go its own way. Bathe in it, drink it, be refreshed by it, share it with everyone, but never fight it, never be swept away by its flow, and never get never be swept away by its flow, and never get attached to it. Observe it. Learn from it.’

Yudhishtira had many questions. Bhishma answered each of them. At one point Yudhishtira asked, ‘Who gets greater pleasure in life? Man or woman?’

‘Not all questions have answers, Yudhishtira. No one knows what you ask, except perhaps Bhangashvana, an ancient king, who was cursed by Indra to turn into a woman. He was the only creature on earth who knew sexual pleasure both as a man and a woman. And only he had children who called him “father” and children who called him “mother”. Only he knows who get greater pleasure.

Finally, Bhishma told the Pandavas about God. ‘Our merits create fortune. Our demerits create misfortune. Merits bring us joy. Demerits bring us sorrow. We are thus fettered by karma. Karma binds us to the material world, compels us to be born and compels us to die. No one can change this, except one. That one is God. Pray to God to cope with the fetter of karma.’

Following this, Bhishma began chanting the thousand names of God. As he mouthed these words, the Pandavas noticed that the sun was now on its northerly course along the horizon. It was time for Bhishma to die.

In Ramayan after death of Ravan Rama told him to share wisdom he learners in his life. In Mahabharat Pandavas asks Bhishma to share his wisdom.

The purpose behind this idea was like wealth knowledge not stay after ones death. It has to be passed on so it won't lost.