Have you heard about this place?  It is in China, was the site of ancient markings and still has tourists visit to this day:

The Reed Flute Cave, also known as Ludi Cave, is 6 km northwest of Guilin in the Mountain of Light.

The cave was discovered in the Tang Dynasty (618-906) and received its name when children carved the reeds at the entrance to flutes. The Reed Flute Cave is 240 m deep and on the 500 m on the long path the visitors can admire colorfully lit rock formations, stalagmites and stalactites.

Let’s explore this bizarre ancient cave in the video on page 2

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