A statue of Li Dazhao, a founding member of the Communist Party of China, at a Beijing memorial. [Photo provided to China Daily]

"Beijing was where several major historic events occurred and houses many such sites, including Tian'anmen Square and former residences of revolutionaries," says Zhao Huan, the publicity manager with Tuniu. "These places let people reminisce about the past."

Travel products, combining red tourism elements, hiking and sightseeing are popular in the summer. And the school summer vacation also helps to boost this kind of tourism.

"This is because many parents take their children to such sites," says Zhao.

Military-themed scenic spots, museums and historical sites also draw parents with children in August, according to Tongcheng Network Technology, an online travel agency in Jiangsu province.

Those between 14 and 35 accounted for 80 percent of all such tourists, according to Tongcheng.

Most such tourism sites feature mountains and water, and allow visitors to enjoy the "red spirit" while avoiding the summer heat.

Meanwhile, 10 red tourism routes connecting Beijing, Tianjin and Hebei province were launched by local tourism authorities in early August. And nearly 100 red tourism spots were included for these routes. The routes tap into "red culture", while focusing on travel experiences along the way.