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 Knoops Park is a magnificent 19th-century garden in the north of Bremen. The park's is mostly famous for its sensory garden, which gives people with impaired vision the chance to enjoy the natural world in an approachable and accessible way. In summer, the Knoops Park hosts a series of classical concerts as part of the 'Summer in Lesmona' music festival.

The Botanical Garden of the University of Zürich shows off its broad collection of flora, both local and imported, on the 5.6 hectares that were laid out in the 1970s. Even when it's raining or when it's cold, you can visit the tropical greenhouses. Each glass bubble represents a distinct climate: the sweltering humidity of the tropics, the dry heat of the Mediterranean, and the flowering alpine meadows.