Every visitor is aware of the existence of Amsterdam's red light district, locally referred to as De Wallen. Some head there straightaway while others prefer to walk around it — the choice is yours. The truth is, you will likely end up wandering through the area simply because of its location right in the city centre. The best way to get acquainted with the city's most notorious neighbourhood and discover its stories and secrets is by joining a walking tour. Follow your guide through winding cobblestone streets and narrow alleys as you learn the history behind Amsterdam's infamous adult destination. See, along the way, oddities like the world's first condom shop, the Museum of Prostitution as well as little-known sculptures, and sex theatres.

This site once was a military fortress and then became the first and most advanced pier in ancient China. Nowadays, it has been turned into a 75-metre tall building on the margin of the Jialing River packed with many restaurants, cafes, temples and craft stalls. When the sun sets, the building illuminates the surroundings, making them look dream-like.

The Cathedral of the Holy Cross and Santa Eulàlia, or simply the Barcelona Cathedral, is the Gothic cathedral and seat of the Archbishop of Barcelona. Its construction began in 1298 on the site of an ancient Roman temple and took more than 150 years to be completed. Located in the centre of the historic Gothic Quarter of Barcelona, the cathedral is dedicated to the martyr Santa Eulàlia – the patron saint of Barcelona – who was tortured to death in late Roman times. Her corpse is buried under the main altar. Be sure to climb to the roof for a nice view of the city, and don't forget to visit the serene and beautiful courtyard, which is occupied by thirteen white geese representing the years of Saint Eulalia's life before she was martyred.

The Menelik Palace is a palatial compound that was the seat of the power of Emperors of Ethiopia. Today, the compound is called Unity Park and contains are several residences, halls, chapels, and working buildings. Visit the Gibr Adarash banquet hall, the Zufan Adarash throne room, the mausoleum that is Emperor Menelik II's last resting place, and the Shengo Hall event hall. The Prime Minister's Office and residence is located here, too, which means that security is pretty strict — bring an ID.