You can get to the Milhostovské mofety Nature Monument (Milhostov Mofettes) by the local circular cycle route No. III, which is marked from the Panorama in Mariánské Lázně. The site has been declared a nature monument on the 19th of May 1997 and it offers a chance to see carbon dioxide and hydrogen sulphide emanations from small craters (mofettes). The mofettes can be seen in the valley of Jilmový potok (Elm Brook), approximately 2 kilometres behind the village of Milhostov. Keep in mind, however, that, from the village, the cycle route is suitable only for mountain bikes. After exiting the village, you have to ride under a railway bridge and ford the Elm Brook. The way from Milhostov is quite challenging, especially in spring when it is quite difficult to wade across the brook due to high water levels. From the ford, the cycle route continues downstream and after about 500 metres, it draws a 1.5 km long loop leftwards to subsequently return to the brook. Once you get to a cycle route signpost, you will find a path leading to the brook. The path is marked by a yellow arrow from the opposite side, i.e. from the south. After about 200 metres, the yellow-marked path will lead you straight to the mofettes. The path is best accessible in frosty weather when the ground is frozen and you do not flounder in the numerous swamps. Many visitors who have gone through a lot of effort to reach the site may find the Milhostov Mofettes somewhat disappointing because all that awaits them are three small holes in the ground. Hydrogen sulphide is traceable in the middle depression where dead animals suffocated by the escaping gas are often found. The depressions are dry, without any trace of water, and there is really nothing interesting to see.
There are probably more disappointed visitors and those who are not willing to lump it and express their disappointment. Nonetheless, as regards nature conservation, carbon disulphide gas emanations represent a valuable nature monument.