There arte a lot different kind of mania in Japan.
And I am going to introduce one mania that is ruins mania.
The Ruin mania loves ruin buildings.
Maybe there are those kinds of people in your country.
Now there is one of the Holy Land place for them.
The name of place is Gunkan Jima (Gunkan Island).
The Gunkan Jima is located to Nagasaki prefecture.
It is used to be coalmine.
And the peak of population was 5267,
which was the most population density in the world at that moment.
But since the energy system moved to oil from Coal,
the coalmine was closed 1974.
and now no one live there.
By the way, the reason why this island is called Gunkan Jima is
the shape is look like battle ship. Gunkan means Battle ship and Jima is island.
Well if you come to Japan, maybe you can visit there.