The mysterious extinct hillfort Bílá.

       One weekend day I was thinking about where to go so that it would be interesting, unusual and that I would remember the trip for a long time. With many of my previous trips, I set the bar very high - Rudické propadání, the lower floor of the Sloupské caves, Jáchymka ("Evin's cave"), Kostelík, the underground tunnels of the "Amerik" quarries, the Post tunnel in the Golden Mountains - certainly one of the most beautiful tunnels that...