Let me first check the treasures of Longxing Temple to make sure they're accurate before adding more words.
Longxing Temple in Zhengding boasts six unique features, each considered the best in the country. First, the Mani Hall from the Song Dynasty, constructed without a single nail, is praised by Liang Sicheng as a unique example of ancient architecture in the world. Second, the Guanyin statue inside, seated backwards, with a beautiful face overlooking all beings, was praised by Lu Xun as an oriental goddess of beauty. Third, the Song Dynasty revolving sutra repository, the oldest existing one, can hold two tons of scriptures and can be turned by one person. Fourth, the Longzang Temple Stele from the Sui Dynasty, the ancestor of regular script and the first Sui Dynasty stele. Fifth, the over 20-meter-tall bronze Thousand-Hand Guanyin, the tallest ancient bronze statue. Sixth, the Ming Dynasty bronze Vairocana Buddha. With all six wonders combined, it's well worth a special trip.