Peak Bulgarka, Sliven, Bulgaria (30km x 300)

This bike route is by far my favourite. Only one hour away from city centre and you are in front of the most magnificent view in East Balkan Mountains (Stara Planina). Not only eco but also challenging as natural denivelation is more than 870m. I cycle on the way up and I do brisk walk on the way back. I've done this route 300 times yearly for the past 10 years and I have not yet tired of it!