The Palacio Real de Madrid, the official residence of the Spanish royal family in the city, is Europe's largest royal palace, boasting a whopping surface area of 135,000 square metres and a staggering 3,418 rooms. This architectural marvel is not only visually stunning, but also features spectacular outdoor gardens and exquisite frescoes, furnishings, and paintings within its walls. Originally constructed in 1764 as a replacement for the Alcázar castle, which had been destroyed by fire three decades earlier, this magnificent edifice is a must-see attraction for anyone visiting Madrid. Nearly the entire palace is open to the public, including the Armoury and Pharmacy.

The Kunstmuseum Basel is one of the best-known museums of its kind in the world. The museum today comprises the traditional main building, the Kunstmuseum Basel | Gegenwart and the prestigious new building.

Dating back to 1132 under the reign of Norman King Roger II, Castello Normanno-Svevo is a true architectural testament to history. Although it endured destruction in 1156 by King William I of Sicily, it was resurrected and fortified in 1233 under the patronage of the Holy Roman emperor Frederick II. Over time, it saw various transformations during the Angevin domination, and after being held by several noble families, it eventually became a prison and barracks under the King of Naples. Encircled by a moat on all sides, except its northern border with the sea, accessible via a bridge and gate to the south, the castle primarily features Aragon walls and the prominent Hohenstaufen tower. Today, it serves as a venue for exhibitions, preserving a rich tapestry of history within its walls.