The Longmen caves stretch for about 1 km so be prepared to walk

  The Longmen Caves are open to the public for the price of 120 RMB (~17$), and indeed the experience is worth it. The caves stretch for about 1 km so be prepared to walk. Excellent caves to visit include the Bingyang caves. These three caves were some of the earliest to be developed in the Grottoes, and were built by the Northern Wei Dynasty from 500 to 523 AD.Vietnam tour

  It was not until 626 that the third phase began, during the height of the Tang dynasty, when Chinese Buddhism had begun to flourish again. This was once again a period of intensive cutting of grottoes; it was the highpoint artistically of Longmen, especially during the reigns of Emperor Gaozang and Empress Wuzetian, who lived permanently at Luoyang. The group of giant statues in Fengxiansi Cave is most fully representative of this phase of Chinese art at Longmen; they are generally acknowledged to be artistic masterpieces of truly global significance.
  The final phase, from 755 to 1127, during the later Tang through to the Northern Song dynasty, saw a steep decline in the carving of grottoes at Longmen. This began with the capture of Luoyang in the mid-8th century during a rebellion, an event from which the area never recovered. It was the outbreak of warfare during the Jin and Yuan dynasties that brought grotto carving to an end.

Prince Gong’s Mansion is the best preserved mansion in China

  Prince Gong’s Mansion is the best preserved mansion in China, including the mansion and the park. Prince Gong’s Mansion covers an area of 61,120 square meters and has more than 30 buildings. Specifically, the mansion takes an area of 32,260 square meters and the park occupies the construction area of 28,860 square meters. It is 330 meters long and 180 meters wide.

  The main building on the East Road is the opera stage. It is a large building which covers an area of over 6895 square meters. It is where the owner of the mansion and his selected guests would watch Peking Opera during festivals and weddings.
  This theater is lofty and spacious, with subtle lighting, and on its walls Chinese wisteria and green leaves are painted, giving the audience the feeling they are sitting beneath trellises. The floor is paved in pseudo-gold brick, and the seats consist of old-fashioned wooden armchairs furnished with square tables. The performers and the audience are in close proximity, so there is no need for audio amplifying equipment. Here, people can enjoy kunqu, Peking Opera and imperial music, a unique experience full of Qing historical significance.

The Temple of Literature is dedicated to the Chinese philosopher Confucius

  One of the oldest sights in Hanoi is the Temple of Literature, called Van Mieu in Vietnamese. The "temple" was founded in 1070 by Emperor Ly Thanh Tong, and is dedicated to the Chinese philosopher Confucius. Six years later, Vietnam's first university was founded here to teach the children of royalty and aristocracy (generally called mandarins). In 1484, another Emperor Le Thanh Tong had stele erected in one of the courtyards to record the statistics and achievements of those who received doctorates from the university. The school continued until its functions were transferred by Emperor Gia Long to the new capital at Hue in 1802.

The Temple of Literature, dedicated to Confucius, was founded in 1070 by Emperor Ly Thanh Tong. In 1076, Vietnam's first university was established here to educate Vietnam's administrative and warriors class. Parts of the university date from this earlier time period although the large complex has undergone many changes over the centuries. But recent archaeological study indicates that the architecture of this site belongs primarily to the Ly (1010-1225) and Tran (1225-1400) Dynasties. The complex is in a tranquil park-like site in the heart of central Hanoi.
   In the courtyards of the Temple of Literature in Hanoi today remained 82 of the 116 steles with the name of all those excellent students. The steles are placed on a stone tortoise (tortoise is the symbol of longevity in the Vietnamese culture). It is a tradition and omen of good luck, touch the head of all turtles, that is the reason why the conservation status of some of these turtles is not very good. The steles dated the first examination by the year 1442, and the last in 1779.