Every spring, the world’s watchmakers and horology enthusiasts descend on Basel for the industry’s key fair, where the latest innovations in timekeeping are unveiled.

Baselworld watch fair is where manufacturers unveil the new timepieces that often take years to craft. There are no quick sales either; brands eager to retain exclusivity don't sell to any old oligarch.

Once a year, the top watchmakers gather in Basel to reveal their newest creations - and the world comes to buy.

Roche and Novartis' hard-fought commercial struggle is being matched by an architectural rivalry that will result in the building of the tallest tower in Switzerland.