Natural Stone Bridges are one of natures magnificent formations and are regarded as natural treasures.
Out of 43 known natural stone bridges in the world 13 are located in small 100x100Km part of Eastern Serbia.
In my humble opinion the most beautiful of these complexes is Heaven stone gate complex.
It is located in River Zamna canyon at the place where gorges of Medvedja reka(bear river) and Zamna combine into one. Near village of Plavna. By official measures this formation is still not a stone bridge but a cave with 3 openings in the ceiling(in few thousand years it will probably form a true bridge). This location is not accessible by car so if u plan to visit this one u will need precise instructions from locals on how to find "Zlatko's house" and the road that leads to Zamna canyon.