This mountain city in Bulgaria is known as the Machu Picchu of Europe but is less crowded and easier to get to, while still full of ancient mysteries.

known for its old town and Roman amphitheater; Varna, a popular coastal destination on the Black Sea; and Veliko Tarnovo, the historic capital of the Second Bulgarian Empire, stand out.

These are "Let it snow", "Winter Wonderland" and "Ave Maria"", the singer tells us. To sing some of the most famous Christmas songs in Bulgarian is an old dream of Rumiana Kotseva: "While I was ...