Conservative methodology for estimation of a potential dose in caves employs solid state alpha track detectors. Obtained data are converted into annual effective dose in agreement with the ICRP recommendations (using the “caves factor”). The more precisely determined dose value would have a significant impact on the radon remedies or on restricting the time guides spent in the underground. To define the calculation of the effective dose in caves, the following measurements were carried out: continual radon measurement (differences in ERC between working hours and nighttime and daily and seasonal radon concentration variations); regular radon and daughters measurements; regular indoor air flow measurements to study the location of radon supply and its transfer among individual areas of the cave; natural radioactive elements content evaluation in subsoils and in water inside/outside to study radon sources in the cave; aerosol particle-size spectrum measurements for determination of free fraction (cave–apartment comparison); guides/visitors behaviour monitoring to record time spent in cave and to assign it to the continuously monitored levels of Rn concentration.