From Klix Media web site:
Helifilm, a production company known for filming and photographing from the air, recorded beautiful nature shots near Kalinovik.
Kalinovik is an ideal destination for escaping from everyday life and exploring the endless mountain expanses. The Helifilm team focused on the mysterious ground pits near Kalinovik, a mystery even to the local population.
The pits lie on the karst plain of Zagorje, surrounded by the high mountains of Treskavica and Zelengora, at an altitude of 1,080 meters. This is an area that has been inhabited since ancient times, as evidenced by numerous stećak necropolises. This beautiful nature takes the breath away.
Watch the 4K aerial video on YouTube: 4K Misteriozne rupe kod Kalinovika (Vrtace ili ponikve) – Ljepote Bosne i Hercegovine iz zraka – YouTube.