The shadow of radiation to the mysterious giant spheres in the western forest of Russia?

There seems to be a huge mysterious sphere in the western forest of Russia.

The spheres that existed quite a while ago are unknown even for what they were made for, but there are mysterious key holes and marks to remind attention to radioactivity. What is this ...?

Details are as follows.
I see something in the forest.


I approached it. It looks like a giant sphere.


It is higher than wood.


It's too big.


There is something like a keyhole.


There are holes in some places. And it shows that radiation is generated with red paintRadiolabelBut.


I entered the place. Graffiti can be seen as a spot.


It has a honeycomb structure.


There is a hole in the ceiling, and light comes in from there.


What is the shape like this floating ring?


It is like a keyhole visible from the outside. Even if it looks at it only it looks like a keyhole.


I do not know what purpose this building was made, but it seems better not to approach as you think that there is a radioactive sign. Or is it a graffiti ...?

The original picture is on the link below.

English Russia >> Wood Ball