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.

There is always something going on at Bell Centre, whether sporting events or concerts; this same 21,000-seat venue hosts the Cirque du Soleil. Alternatively, you can take one of the guided tours that will take you all the way to the locker rooms. Taking pictures is allowed and encouraged.

Berlin boasts the world's first computer games museum, which opened its doors in 1997. Since January 2011, the museum has been showcasing its new permanent exhibition in the fashionable Friedrichshain district. The exhibition has ingeniously converted the historic interior of the former East Berlin café, Warsaw, into a pixelated gaming landscape. It's the perfect spot to unwind, play some beloved video games, and delve into the history of the gaming industry. The Computer Games Museum is conveniently located on the Karl-Marx-Allee, the largest European cultural monument.

This sublime concert hall designed by Lluís Domènech i Montaner and built between 1905 and 1908 is not quite as wacky as some of Gaudí's architecture, but it is still equally impressive. The Palace of Catalan Music not only pays tribute to the musical heritage of the Catalans but to all music, as well as beauty, colour, and joy.