The Xiaozhai Tiankeng, often called the “Heavenly Pit,” stands as the planet’s largest and deepest known sinkhole. This ...

The Xiaozhai Tiankeng stands as the textbook example of what happens when karst processes are given perfect working ...

Picture this: A full orchestra performing nearly 300 meters beneath the Earth's surface. The Zhangjiajie Philharmonic Orchestra brought this dream to life inside a vast natural sinkhole in central ...