Franz Kafka once wrote, 'Mother Prague has clutches', referring to the city's captivating charm. Prague's winding streets will captivate you, making you love every second. Gothic alleyways echoing with history and the sight of the moon hovering behind the towers and pinnacles create an unforgettable experience. Once you've explored Europe's most enchanting capital, you'll definitely want to come back.

Moscow is a city of contrasts where the bohemian and the glamorous merge in an idiosyncratic fusion – do not be surprised to find a golden-domed 16th-century church next to an ultra-modern glass skyscraper or a Soviet blockhouse. Here, salty fish eggs (caviar) are washed down with bubbly champagne, and worn-out commuters travel by the elaborately decorated, elegant metro, one of the city's main attractions.

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.

As the birthplace of America, Philadelphia has endured centuries of hardship, obstacles, and triumphs, and remains a top tourist destination in the U.S. Historical buildings, sculptures, and murals line streets that were once walked by the Founding Fathers. While the weather fluctuates between mild springs, hot summers, and chilly winters, the people of Philly can always be seen out and about in the City of Brotherly Love.