假设你是李华，你的笔友Jason 对中国文化非常感兴趣，打算来中国参观一些世界文化遗产．请你根据所给信息，给Jason写一封电子邮件，介绍洛阳的龙门石窟．
名称龙门石窟（Longmen Grottoes）
地理位置位于河南省洛阳市南郊的伊河两岸，离市区12.5公里．
开凿时间从北魏至北宋，历经400多年．
艺术价值①是中国古代雕刻艺术的重要组成部分，现存有窟龛（niche）2300多个，造像（image）10万余尊；
②反映了中国古代政治、经济（economy）、宗教、文化等许多领域的发展变化．
注意：1．词数100左右（开头和结尾已给出，但不计入总词数）；2．可以适当增加细节，以使行文连贯．
Dear Jason，
I am glad to know you are coming to visit China．I am writing to recommend one of the World Heritage Sites in China-Longmen Grottoes．

The Longmen Grottoes stand on the banks of the Yi River，12.5 kilometers south of Luoyang City in Henan Province．The carving project began in the Northern Wei Dynasty and lasted for more than 400 years until the Northern Song Dynasty．At present there are over 2，300 niches，more than 100，000 images．The grottoes are an important part of ancient Chinese sculptures，and show great changes in ancient Chinese politics，economy，religion，culture and so on．
The Longmen Grottoes is well worth a visit because of its long history and natural beauty．

The Longmen Grottoes stand on the banks of the Yi River，12.5 kilometers south of Luoyang City in Henan Province．The carving project began in the Northern Wei Dynasty and lasted for more than 400 years until the Northern Song Dynasty．At present there are over 2，300 niches，more than 100，000 images．The grottoes are an important part of ancient Chinese sculptures，and show great changes in ancient Chinese politics，economy，religion，culture and so on．
The Longmen Grottoes is well worth a visit because of its long history and natural beauty．

I hope you'll have a good time in China．
Yours，
Li Hua．