Each of the chosen landmarks has its own individual seal, which is stamped onto pages of an official passport-like booklet issued by the Bulgarian Tourist Union (BTU).
A booklet can be purchased at any tourist union center or on location at any of the sites and it costs a symbolic 1 lev.
Depending on the number of stamps collected, participants may receive bronze, silver or gold badges.
The National Organizational Committee of the BTU holds an annual lottery for the previous year's badge earners every August.
Prizes include domestic and overseas excursions, bicycles, tents, sleeping bags, and other travel-related items.