The Palais des Nations, once home to the League of Nations, now serves as the UN’s European headquarters. You can take a guided tour (with advance booking) to see spaces like the Assembly Hall and the Council Chamber, where international negotiations still happen today. The building sits inside Ariana Park — a quiet, green space dotted with old cedars, roaming peacocks, and views down to the lake.

The Alcazaba of Badajoz is the city's historic fortress that once served as the home of the Taifa kings. As the city's former defensive structure, it is surrounded by several towers, as well as the Guadiana River, much to the visual delight of visitors.

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.