The Bear's Cave situated in Sudety Mountains has three levels and is 3,000 meters long. There are impressive dripstone formations to be seen here.
Chełm’s star attraction and a unique tourist route are its underground chalk tunnels that run under the city for two kilometers at a depth of 27 meters. The route leads through old chalk passages hewn out by hand.
The gold mine in Zloty Stok is one of main tourist attractions in Lower Silesia. Besides visiting the adits and the underground waterfall, it is possible to take an underground boat trip.
The Międzyrzecz Fortified Region is one of the biggest fortification in Europe. Built in 1934-1938 by Germans along the polish border it is now one of the main attractions of the Lubuskie Region.
The visit in the museum involves both underground and overground parts, and an underground train ride.