Found Weird House Lost in the Forest

So I was exploring a nearby forest with a friend when we suddenly encountered this weird house that seems to have been on lock-down for years, every possible entrance have been lock with some really strong iron plates, pretty much impossible to move. What's even funnier is that it's located in a forest kinda close to my home, and it happened that my family own a huge part of said forest, and no one in my family knows what the fuck is that house and who built it, nor who own it, even my grandma that lived in this town for the past 80 years and literally everything you need to know about that town have no idea. There is no report in our town hall about that house, and no post boxes or address for that house...

We are gathering some stuff and informations with my friend and I'll make sure to post an update when we'll get inside or get new pics from inside in a few days.

Make sure to let me know what you think about it and if you have any idea about how you would get inside, it's the first time I'm trying to enter an abandoned place that have been locked up like that we usually explore ruins or stuff like that...

Another angle from the front.

The "Porch".

Random things on the front of the house.

Front window.

Front window lock mechanism.

Front window iron plates.

Left side of the house.

Back of the house with a weird wooden door with 2 lock on it and a missing door handle.
We can clearly see a weird "walled door" as well on the right.

One of the both lock, wooden door on the back o f the house.

Missing door handle, the door seems to have been reinforced with metal, it looks really heavy and deep.

Long exposure shot in the door hole.

Second try.

A door to a cellar ? Back of the house.

Another window, left side.

Left side, door and window.

Door on the left of the house, lock mechanism.

Weird trap (locked), back of the house. (Air vents ?)

Trap lock mechanism.

EDIT : I can't believe we've made it to the front page, Thx you guys for your support, due to the popularity of this post and how much some peoples seems to be interested in that, I've created a Discord so you guys can ask me questions and get update on the exploration live !

https://discord.gg/VZ4GSY

So next, as you know one of the biggest concern I've got is that I have to make sure that it's on my family land, and thanks to someone in the comment who proposed that idea, using phone history I retrieved the exact coordinate of the place so know after spending way too much time on my phone and calling administratives I've got the plot ID i needed to get more info.

So I'll try to make a few phones calls in town tomorrow and I hope I'll find out more.
But no matter what we find out next days we'll get back there this week-end with some friends and with some equipment and we'll see what's inside even if we don't "break in" so make sure to stay tuned.

Thanks again for your precious advice and support, I'll see you soon !