Prompt: Write a short story about a man who discovers a magical portal

It was a cloudy day, and the old man was feeling down. He had been working at the same job for years and years, and he was just about ready to retire. But then he found a magical portal.

The portal looked like a normal door, but when the old man touched it, he could feel a strange energy surrounding it. He pushed the door open and stepped through, and when he did, he found himself in a whole new world.

The old man was amazed at all the beautiful things he saw. There were castles, beaches, and more. He walked for hours, and when he finally returned to the portal, he found that it had disappeared. But he was so happy, and he knew that he would visit this new world again soon.