There was a frum couple, already in their early fifties, who showed up to the grave with a stack of fliers to give out, and two babies. The fliers told their story: They'd been married for more than two decades, and hadn't had any children.
They'd tried everything: there wasn't a doctor, a specialist, a rabbi, a segula that they hadn't tried to merit having children. They'd literally spent hundreds of thousands of dollars flying all over the world, trying to find the person, the solution, that was going to enable them to have children.
One day, the couple met a Breslever chassid, who told them they needed to go to the biggest doctor in the world. The man was all ears: who was he? Where did he live? The chassid told him: 'Rebbe Nachman, in Uman' - and by his own admission, the man was pretty turned off.
After all, they'd already tried every rabbi, every Admor, and no-one had been able to help them.
"Ah, but Rebbe Nachman is a doctor, not just a Rebbe. He's going to fix your problem at its root."
The man was still not very impressed, but his wife felt it was worth a shot: why not? They'd tried everything else. Finally he agreed to visit the grave in Uman, but on condition that he was only going to stay for 10 minutes.
The couple arrived, and he reminded his wife to be waiting outside for him, promptly, after 10 minutes.
The man stepped into the enclosure around the kever - and immediately started crying. He stood there, sobbing from the depths of his heart, for two and a half hours solid, without keeping track of the time.
Suddenly, he looked at the clock, and realised his wife had probably been waiting for him, and wondering what had happened to him, for two hours already.
He rushed outside to find her - and just at that moment, he saw her coming out of the entrance to the women's section. Turns out, she'd also stepped inside, and started sobbing hysterically. She'd only just come to her senses, and was rushing outside to find her husband.
A year later, the couple were blessed with twins. They came back to Uman to say thank you to Rebbe Nachman for their miracle, and to share their story.