Located 16 kilometres from Belgrade, Avala Mountain is a true green oasis and perfect place to relax and enjoy nature. At the summit of the 506-metre-high mountain, there is a Monument of the Unknown Hero built by the famous sculptor Ivan Meštrović, on the site of the old mediaeval fortress Zrnovo.

The New Mexico State Capitol, known locally as the Roundhouse, is the seat of government in New Mexico. It is the only round state capitol in the United States. Designed to resemble the Zia Sun Symbol when viewed from above, there are consequently four entrance wings that protrude from a main cylindrical volume. Above each entrance is a stone carving of the State Seal of New Mexico. One of the building's levels is below ground.

Also known as the Rock Church, this place is carved straight into granite in the middle of Helsinki. From the outside, it kind of looks like a grounded spaceship. Inside, the rough stone walls, copper dome, and skylight ring give the space a quiet, otherworldly feel. It’s still used for services, but you’re just as likely to catch a concert here, thanks to the natural acoustics, which are genuinely impressive.

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.