Drum tower (China - Treaty Ports- Nanking 1896)

Stamp Drum tower it reflects the thematic directions:

Gates is the plural of gate, a point of entry to a space which is enclosed by walls. 

A pagoda is a tiered tower with multiple eaves common to Thailand, Cambodia, Nepal, China, Japan, Korea, Myanmar, Vietnam, and other parts of Asia. Most pagodas were built to have a religious function, most often Buddhist, but sometimes Taoist, and were often located in or near viharas. The pagoda traces its origins to the stupa, while its design was developed in ancient India. Chinese pagodas (Chinese: 塔; pinyin: Tǎ) are a traditional part of Chinese architecture. In addition to religious use, since ancient times Chinese pagodas have been praised for the spectacular views they offer, and many classical poems attest to the joy of scaling pagodas.