In the detail 

Here’s a building that bulges out at the top, but the bulge contains nothing but fresh air. So what is the building?

Can you identify this building to win a bottle of Quinto do Vale D.Maria 1999 gold medal-winning port and a £25 drinks voucher, courtesy of door manufacturer Vicaima?

This is premium content

Only logged in subscribers have access to it.

Login or Subscribe to view this story

Existing subscriber? LOGIN OR

Take out a Premium or Digital subscription and you will get immediate access to:

  • Breaking industry news as it happens
  • Expert analysis and comment from industry leaders
  • Unlimited access to all stories, including premium content
  • Full access to all our online archive

Get access to premium content subscribe today

Alternatively REGISTER for free access on selected stories and sign up for email alerts.