In the period 2007-2012, on the hill “St. Spas” near Belchin village, a number of geomagnetic and dowsing surveys had been conducted the findings of which prove that the area of the fortress “Tsari Mali grad” has strong energy field and high negative ionization.

The high energy values in this place date back to ancient times – the Thracian sanctuaries discovered nearby – cult pits and a well-hole served for tracking calendar and observation of the starry sky.

Located at the crossroads between Vitosha and Rila mountains, the hill “St. Spas” is the ideal starting point for the cirque of the Seven Rila Lakes and the Rila Monastery.