Pisa Baptistery, Battistero di San Giovanni, shares grounds with Pisa Duomo, where the Leaning Tower is located. It took more than two centuries to complete. This amazing marble Baptistery is the largest one in the whole of Italy, and dates back to the 12th century. Pay your visit in the early morning to experience the amazing acoustics without the hum of the crowd. The Cathedral is an incredible work of art with more than a thousand years of history, and its design influenced many other buildings in the whole country.

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.

Another one of Luxembourg's historic castles, the now decrepit one in Esch-sur-Sûre was originally built in the Romanesque style as early as the 10th century, with later Gothic additions two centuries later. Inhabited by commoners for a time, it is now but a relic of Medieval Europe open to the public.

Both castles of Beaufort are worth a visit. The first, demolished during the Battle of the Ardennes of WWII, is now in ruins, the second — a Renaissance château— can be visited on a pre-booked guided tour during high season. Tasting of a locally made fruit liquor is included in the price of admission.