Souvenir by Philip K. Dick - A hideous nightmare seemed the culture of Williamson's World–to men who knew nothing of beauty.

"Here we go, sir," the robot pilot said. The words startled Rogers and made him look up sharply. He tensed his body and adjusted the trace web inside his coat as the bubble ship started dropping, swiftly and silently, toward the planet's surface,

This–his heart caught–was Williamson's World. The legendary lost planet–found, after three centuries. By accident, of course. This blue and green planet–the holy grail of the Galactic System, had been almost miraculously discovered by a routine charting mission.