A drone captures an aerial view of a heart-shaped pond at the Tongluoshan National Mine Park in Southwest China’s Chongqing on April 1, 2017. The park was built on mine pits and cliffs, which were left by local stone companies required to shut down by the government. [Photo/Xinhua]

A drone captures an aerial view of a heart-shaped pond at the Tongluoshan National Mine Park in Southwest China’s Chongqing on April 1, 2017. The park has 39 disused mine pits.[Photo/Xinhua]

Rainwater gathers in the park’s mine pits, which make clear ponds of various shapes and sizes. [Photo/Xinhua]

Two tourists stand on a steep slope at the Tongluoshan National Mine Park in Southwest China’s Chongqing on April 1, 2017.[Photo/Xinhua]