jan hunter, he's a research that to some study. participants moved around in a virtual forest. the others walked through a real one. all of them, the virtual and the real forest walkers felt more relaxed, afterwards, faucets and so which ultimately suggest that digital environments can offers stress reduction and recreation to whom beaten can. one explanation, the theory of attention restoration. in everyday life, we are constantly attentive, always oriented towards a goal. our brain cannot provide this goal oriented attention forever. at some point, we get exhausted in nature. we are attentive in a different way, not goal oriented, more effortless. the brain benefits from that, libya is a fuel hobbin and a 2 different items on the scene. vixen them. when nature makes us feel like we're a little bit away from it all, then we have this underwrite it attention of it. we experienced this fascination a theory, and we can re focus our attention again in the office. and at the end of the day that our research shows that nature does that for us to real nature, as well as virtual natur

. >> reporter: if x marks the spot, that sound means treasure hunter jan hinsen could be getting closer says, "i'm quite tickled. i've been searching this yarp for 30 years and have found some nice roman objects but i never knew nazi treasure was buried here." the dutch national archive revealed the news, posting a treasure map online that was kept hidden for 75 years under the official secrets act. this archives official says the red crosses show where four boxes of treasure are buried. millions of dollars' worth of treasure. she says there are broaches, necklaces, silver and gold coins, rubies, diamonds, lots of valuables. modern-day explorers are descending on the dutch town, which was on the front line in world war ii, hoping to uncover the booty german soldiers looted after a bank explosion in 1944. the town's mayor says it's all pretty fascinating but he's a bit afraid. "i just don't want people to start digging haphazardly," he says, "or it will get out of hand." hinzen is still on the hunt. he says, quit think it's buried here, and i'm not the only one because i already see some