For over two billion people worldwide, Mecca is the holiest site, revered as the birthplace of Prophet Muhammad and the city where the Quran was revealed. Because of its profound religious significance, millions of Hajj pilgrims journey here every year from all corners of the globe, making Mecca one of the most culturally and ethnically diverse cities in the Muslim world — a true melting pot of peoples and cultures. Remember that this holiest of cities, known as Makkah, is only accessible to Muslims.

When in Debrecen, use your senses instead of just looking for the signposts. Look down ahead of you to see on what kind of planks the citizens walked the streets in days of old. Look up to the sky and marvel at the colourful facades of the merchants’ houses, built at the beginning of the previous century. Follow your nose to the pleasant smells from the busy Mediterranean squares and intimate cafés, or simply listen to your ears and let the charming music guide your steps.

Glasgow is the 21st-century magnet of Great Britain, with an energetic yet sophisticated vibe. Formerly Britain's major centre of industrial prowess, it has transformed into a booming hub for art and culture in the past decades. The city prides itself on a never-ending stream of up-and-coming musicians and a thriving nightlife. Glasgow is also home to many excellent modern Scottish restaurants dedicated to preserving their Scottish heritage. Some of the best shopping in the country can be found here, too.

A gateway between the two nations of the Iberian peninsula, Badajoz lies as close to Lisbon as it does to Madrid or Seville, and the city draws on influences from both sides of the border, as well as from centuries of tumultuous history, to form its distinctive character. Winding medieval alleys and a skyline dotted with palace towers make the historic town a sight to behold, while the remnants of the majestic Alcazaba watch over the city as they have for centuries, once an impenetrable fortress that protected the area from countless invasions.