Though Switzerland has been a republic since the 14th century, in the world of art fairs Art Basel is the ruling monarch. After expanding its global empire to Miami Beach in 2001 and then Hong Kong in 2013, Art Basel’s parent company MCH Group has built itself a new castle at this turn in the Rhine river. An imperious structure of undulating steel bands designed by hometown architects Herzog & de Meuron now dominates one side of this quaint city. The new Messeplatz structure makes evident the outsized hubris that fuels an art fair that now tops more than 300 international galleries, and remains the ultimate one-stop shop to buy and sell contemporary art. Here’s a look around the Unlimited section, curated by Gianni Jetzer of the Swiss Institute in New York, which opened on Monday and features installations and projects too large for an ordinary gallery booth.

• Switzerland