The Xu Ling Grotto-Heaven was a sealed small world.
The Tang family had absolute control over the Xu Ling Grotto-Heaven. Perhaps it was because of this that there were almost no guards in the Xu Ling Grotto-Heaven.
After all, under normal circumstances, outsiders couldn't enter the Xu Ling Grotto-Heaven.
There was no need to add another door behind the door.
Following Tang Shiyi's memory, Zhou Shu arrived at the Tang family's warehouse unimpeded.
The Tang family had built this so-called warehouse by hollowing out a mountain.
The mountain was thousands of feet tall, and the entire mountain had been hollowed out. It was conceivable how big the space inside was.
In this large space was the thousands of years worth of collection of the Xu Ling Grotto-Heaven. As soon as Zhou Shu entered, he was shocked.
To describe the Xu Ling Grotto-Heaven as being rich enough to rival a country was underestimating it.