Qingdao is also home to several unique institutions, including the country's only comprehensive marine university, national museum of marine archaeology, and naval museum, as well as its first aquarium, the Qingdao Aquarium, which was built in 1932.

Qingdao's 800-kilometer coastline is dotted with 49 bays and the famous Taoist Laoshan Mountain. The city also connects vibrant urban districts, including the West Coast New Area, which contributes one-third of the city's GDP.

Ren said Qingdao is making efforts to learn from global cities in revitalizing historic districts, especially its sister cities. "The ultimate goal is to benefit locals, improve the quality of their lives, and attract visitors to experience our culture and lifestyle," he said.

The Japanese city of Shimonoseki is Qingdao's first sister city, and Hungary's Somogy County just became its 95th. Ren said that sister city cooperation plays a vital role in international exchange, adding that the more distinct and different sister cities are, the greater the opportunities for collaboration. "Friendship fosters cooperation, and cooperation promotes development," he said.

According to the mayor, the city intends to make good use of exchange mechanisms to expand practical cooperation and extend people-to-people diplomacy.

"We sincerely welcome friends from all over the world to visit Qingdao and experience the infinite charm of this city of vigor, culture, and hospitality," Ren added.