Cologne Cathedral: It is a Catholic cathedral in Cologne, Germany. It is an undisputed landmark building in Cologne. The 157-meter-high bell tower makes it the second church in Germany (after the Ulm Cathedral in Ulm), the third highest in the world, and the third largest Gothic church in the world (the first two are the Cathedral of Seville and the Cathedral of Milan). It was built in the mid-13th century, and the project was intermittent. It was not completed until 188 by Kaiser William I, which took more than 6 years, and it is still being repaired today.

Big Ben: The famous old clock in London, England, that is, the clock tower of Westminster Palace (coordinate: 51 3 ′ 2.2 ″ n, 7 ′ 28.6 ″ w) attached to the British Parliament Hall, which was built in 1859. Installed on the 95-meter-high bell tower on the east side of Westminster Bridge North Parliament Building, the round bell plate around the bell tower has a diameter of 6.7 meters and is a traditional landmark in London. In June 212, Britain announced that it would rename the bell tower of Big Ben, a famous landmark in London, to elizabeth tower.

Vatican St. Peter's Basilica: also translated as Vatican St. Peter's Basilica, it is the central church of Roman Christianity, the pilgrimage site of European Catholics and the Vatican Pope's Holy See. It is located in the Vatican and is the largest cathedral in the world.

Vienna Golden Hall: It is the oldest and most modern concert hall in Vienna. It is the legal place to hold the Vienna New Year Concert every year. Since 1939, the Vienna New Year Concert has been held here on January 1st every year, which was interrupted by the war and resumed in 1959. The Golden Hall was built in 1867 and completed in 1869. It's an Italian Renaissance building. The exterior wall is yellow and red, and many statues of music goddesses stand on the roof, which are quaint and chic. The Vienna Symphony Orchestra holds at least 12 concerts here every quarter. On January 6, 187, the Golden Grand Auditorium of the Concert Hall held its first performance. From 1872 to 1875, the famous musician Brahms was in charge of organizing music.

Louvre: It is one of the oldest, largest and most famous museums in the world. Located in the north bank (right bank) of the Seine River in the center of Paris, France, it was founded in 124 and has reached today's scale after more than 8 years of expansion and reconstruction. The Louvre covers an area of about 45 hectares (including lawns) and the building covers an area of 4.8 hectares. The total length is 68 meters. Its overall building is U-shaped, which is divided into two parts: the old one was built in the period of Louis XIV, and the new one was built in the period of Napoleon. The pyramid-shaped glass entrance in front of the palace was designed by Chinese architect I.M. Pei. At the same time, the Louvre is also the oldest palace in French history.