If you come to Nanjing for three days, I am very happy to provide you with the following travel guide: Day 1:1. Sun Yat-sen Mausoleum: One of the representative attractions in Nanjing is the tomb of Dr. Sun Yat-sen, the great democratic revolutionist in modern China.

It has a very beautiful environment and architecture. It is a good place to learn about China's modern history.

2. Presidential Palace: This is a very historic place in China’s modern history.

This was once the birthplace of China's modern democratic revolution. The Presidential Palace has a natural architectural layout and exquisite workmanship. It is one of the best-preserved large official buildings from the Republic of China period in Nanjing.

3. Xuanwu Lake: This is the largest urban lake in Nanjing. There is a beautiful central island in its center. The Xuanwu Lake Terminal Railway Service Center, Xuanwu Lake Scenic Area Management Office, Xuanwu Lake Highway Station,

Facilities such as water bus terminal and viewing platform.

Day 2: 1. Nanjing Museum: This is one of the earliest national museums in China. It has a large collection of ancient Chinese cultural relics, including porcelain, jade, bronze, calligraphy and painting, etc., as well as the works of many famous calligraphers and painters.

2. Zhonghuamen Castle Ruins: This is another historical site in Nanjing and a national key cultural relics protection unit. You can learn about the construction methods of ancient cities and related historical and cultural knowledge, and you can also appreciate many beautiful buildings, landscapes, etc.

3. Confucius Temple: This is another famous attraction in Nanjing.

There is a market with traditional Chinese elements here, where you can taste various traditional Nanjing snacks, buy souvenirs, and enjoy various traditional cultural performances.

Day 3:1. CCTV Tower: This is the best place to watch the night view of Nanjing. You can also learn about the history of the development of Chinese television and some related knowledge.

2. Purple Mountain Observatory: This is an important astronomical observation base in Nanjing.

There are many exhibitions and popular science activities here, especially for those interested in astronomy.

3. Xingjiang Waterfront Park: This is a charming park where you can walk, play ball, and ride a bicycle along the river to see the pleasant natural scenery of Nanjing.