Some of the Moravian Karst caves are open for tourists throughout the year. You can visit Punkevní caves where you can  go on the boats along the underground river Punkva and to enter the bottom of the Macocha Abyss.
Opening hours can be found here:
http://www.cavemk.cz/punkevni-caves/punkevni-service-live.html

The big attraction for tourists is the cave Výpustektoo, which served as a place for the weapon factory  of the Nazi Army and as a a nuclear shelter for the Czechoslovak army.
Opening hours can be found here:
http://www.cavemk.cz/the-vypustek-cave/vypustek-service-live.html


Third cave opened for public in winter are the Sloupsko-šošůvské Caves that also offer special tours in the light of flashlights in winter.
Opening hours can be found here:
http://www.cavemk.cz/sloupsko-sosuvske-caves/sloup-service-live.html

Cave Balcarka and Catherine Cave  are closed during the winter, because they serve as winter habitat for bats, which should be allowed a restful sleep.

Come and experience the winter romance of the Moravian Karst!