I am starting this thread in hopes that other posters will also contribute. Every once in a while for fun, I do a search on the internet looking for different places in the PRC (Mainland China, Hong Kong, and Macau) where you can see the ROC flag and/or the Guomindang party flag. Many outsiders may not realize it but even though the ROC flag may not be displayed publicly in media or by individuals out on the street in these places, it can still be found in history museums and other designated places of historical interest, especially landmarks associated with Dr. Sun Yat Sen, the founder of the Republic. Rarer but still spottable are the five color Beiyang flag and the original TongMengHui eight point flag. This is not an exhaustive list but here are a few:
Guangzhou:
Location of first Congress of Guomindang
https://commons.wikimedia.org/wiki/F...g_of_China.jpg
Sun Yat Sen Memorial Hall
https://www.chinadiscovery.com/guang...guangzhou.html
Zhongshan, Guangdong:
Museum of Former Residence of Sun Yat Sen
https://www.chinadragontours.com/mus...shan-city.html
Nanjing:
As the former national capital, Nanjing probably has the most places where you can spot the ROC flag
Nanjing Presidential Palace:
Nanjing Presidential Palace - China.org.cn
https://www.istockphoto.com/photo/to...0382-261586120
https://www.triphobo.com/places/nanj...ace-of-nanjing
Sun Yat Sen Mausoleum:
Dr. Sun Yat-sen's Mausoleum - Nanjing Attractions & Sights
https://en.wikipedia.org/wiki/Sun_Ya...hongshan12.jpg
https://commons.wikimedia.org/wiki/F..._Mausoleum.jpg
Beijing:
Museum of the War of Chinese People's Resistance Against Japanese Aggression
China — WARMAP
Xian:
Xian Incident Memorial Hall
https://www.xianprivatetour.com/attr...orial_hall.htm
Tengchong, Yunnan
Cemetery of Revolutionary Martyrs (Guosheng Cemetery):
https://international.thenewslens.com/article/109239
Liaoning:
Former residence of Marshall Zhang Xueliang
https://www.visitourchina.com/shenya...-xueliang.html
Macau:
Sun Yat Sen Memorial House
https://www.agefotostock.com/age/en/...na/X2L-3513283
Yeah, spotting the ROC flag while in the PRC is like treasure hunting. I'm sure there are a lot more historical places with the ROC flag so anyone else feel free to share and maybe the next time we're in China, we'll hunt them down to see.