Bulgaria has begun construction of the longest tunnel in the Balkans, as part of the railway between Sofia and the Bulgarian Black Sea city of Bourgas.
The tunnel is located about 30 kilometres from Sofia in a mountainous area and is 6.8 kilometres long, making it twice as long as Bulgaria's current longest tunnel, in Koznitsa.
Bulgaria is a stunning country in eastern Europe. The capital, Sofia, is a super popular tourist hotspot. But if you did decide to visit this gorgeous place, you will find out that Bulgaria has a lot more to offer. From high mountain tops to breathtaking beaches by the Black Sea, every tourist can find something fun to do here.