Spiral stairs lead to a circular fountain in Nanning. /CFP
A building is designed in the shape of a hollow tube in Kunming, Yunnan. /CFP
The Ring of Life is a landmark 157-meter-tall steel loop in Fushun, Liaoning Province. /CFP
The Gangxia North subway station in Shenzhen, Guangdong Province features a circular design in its roof. /CFP
The Tianjin Eye stands at 120 meters tall and offers lofty city views of Tianjin. /CFP
March 14 marks Pi Day in line with the date-style 3.14, which is also the rounded-off value of π, or pi. With pi being used to calculate the circumferences of circles, designers and architects across China can create beautiful curves and circles in buildings. In honor of Pi Day, check out these landmarks and buildings featuring circles and the "pi" effect.