Built between 527 and 565 AD at the foot of Mount Sinai for Emperor Justinian, this monastery later took its name from St Catherine of Alexandria, whose remains are said to rest here. It’s more fortress than church, with thick stone walls guarding the Church of the Transfiguration, the chapel of the Burning Bush, and a monks-only library packed with ancient manuscripts. Inside, you’ll find mosaics, religious ornaments, and some of the oldest illuminated manuscripts in the world on display. Outside, don’t miss Moses’ Well and the garden with centuries of history. The place is open most mornings but closed on Fridays, Sundays, and Orthodox feast days. Still active today, the monastery holds importance across Christianity, Judaism, and Islam, and continues its Greek Orthodox traditions uninterrupted.

The Hassan II Mosque commands a dramatic presence on a promontory overlooking the Atlantic Ocean. Capable of accommodating over 100,000 worshippers in its vast interior and courtyard, it is not just a religious monument but also an architectural marvel. The mosque's minaret soars to a height of 210 metres, making it among the tallest in the world. Adding to its distinctiveness, the mosque features a floor made entirely of glass, creating an awe-inspiring effect.

Housed in a beautiful 1929 Spanish Colonial Revival mansion, McNay Art Museum, Texas's first modern art museum, showcases a diverse collection that spans from Medieval and Renaissance art to contemporary works of the 21st century. Highlights include European and American masterpieces, as well as notable theater arts pieces.

The Church of Mary of God of Trsat is the largest centre of pilgrimage in western Croatia. Its founding is reportedly related to the miraculous transport of the Nazareth Barn, and its stay on Trsat (1291–94). Shortly after the relocation of the Mother of God's house to Loreto, Prince Nikola I of Krk built the first small church on the place where the barn stood on Trsat.