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.

The medieval settlement included an inner city-citadel on a high rocky plateau, an outer city and unfortified suburbs.

2019's "European Capital of Culture" and Bulgaria's second largest city ... the amphitheater are the best conserved of the city's ruins, there are many more fascinating archeological sites ...