龙门(即伊阙)
The east city gate of the capital of chu state in warring states period of 475-221 b.c. Jiyijue

Poet: Du Fu
  龙门横野断,驿树出城来。气色皇居近,金银佛寺开。
  往还时屡改,川水日悠哉。相阅征途上,生涯尽几回。