Sweatbox heaven: welcome to the sauna and steam of your dreams

From steamrooms suspended under remote Czech bridges to the Swedish robot sauna straight out of Star Wars, the spa experience is getting a guerilla makeover

1 Undershaft, the tallest skyscraper in the City of London, revealed

Architect Eric Parry unveils plans for tallest skyscraper in the City – but the orgy of billion-pound towers doesn’t stop there

‘It’s an insult’: Chinese property developers race to the top of London’s skyline

Giant luxury towers (with their own karaoke rooms) to spring up around the city as eastern investors look to Britain. But residents fear deals will force them out

Rem Koolhaas crafts a spectacular ‘city of art’ for Prada in Milan

A new Roman Polanski film is being shown, Jeff Koons and Donald Judd artworks are strewn about, and Wes Anderson’s designed the kitsch cafe … in a scruffy industrial corner of Milan, Rem Koolhaas and Miuccia Prada have made a dazzling art space, so vast it’s practically a city. Oliver Wainwright is in awe

Thomas Heatherwick plans $170m hovering miracle island for New York

The designer has dreamed up a Disneyfied island on stilts that boasts woodland, performance spaces and places to ‘wander and wonder’. But is this fairytale of urban planning too good to be true?

Zaha Hadid’s Tokyo Olympic stadium slammed as a ‘monumental mistake’ and a ‘disgrace to future generations’

The 2020 Olympic stadium has faced two years of widespread criticism and budget cuts. Now prominent Japanese architect Arata Isozaki has launched a blistering attack on the designs