If you’ve found a few geocaches, you know that sometimes in order to find the geocache, you have to explore places you’ve never been before. Sometimes those places are in full-view of the public or in a popular park. And sometimes, like in the case of this week’s Geocache of the Week, the geocache will take you to an abandoned underground hideout.

Just outside of Stockholm, Sweden lies Antuna Underground (GC2B3BY), a difficulty/terrain 4 Unknown Cache that only the brave should attempt. For safety reasons, it’s probably best to tackle this geocache with two or more people. In order to find the physical geocache, you’ll have to don a headlamp, put on some boots, and overcome any spider fears you have as you descend into a forgotten place. Check out the video below to see two brave cachers earn their smiley:

[youtube=”http://www.youtube.com/watch?v=rlpsn784UT0″]

Locations like this have long histories. From the geocache page: “This facility was completed in 1944 as a backup location for power generators for the railway system in times of war. It was finally shutdown in 1991 and is today completely abandoned.” In Sweden and some other countries (not the United States), venturing into places like this is not considered trespassing. To complete the geocache, you have to navigate through the facility, find hidden numbers and solve an equation to locate the final geocache location.

This geocache was actually the product of a collaboration between several geocachers who call themselves TeamGroundZerO8. One team member had this to say about their geocache, “The thing that makes me proud of this cache is that it has made many geocachers stretch their comfort zone quite alot. Many [Urban Exploration] caches are T5 and out of reach for a big majority of our community. This cache offers a great adventure in a type of location few have ever visited and forces our visitors to do things they never thought they dared such as climbing rusty ladders 10 m above ground in darkness with only a headlamp. Almost all visitors have come out on the other side with a smiley on their map, and I think that almost all did it with a big smile on their face. The average length of the log entries also shows that most of them have a great story to tell both us and probably their friends afterwards.”

This geocache takes you to a place with quite a history. What geocaches have you found that have been in amazing historical places? Tell us in the comments.

Continue to explore some of the most engaging geocaches around the globe. Check out all the Geocaches of the Week on the Geocaching blog.

If you would like to nominate a Geocache of the Week, leave a comment below with the name of the geocache, the GC code, and why you think we should feature it.