10. RYUGYONG HOTEL, PYONGYANG, NORTH KOREA. Riddled with issues that range from lack of money to poor construction to rumored collapse, this still unfinished building has been under some form of construction for over 20 years / Reuters

9. NATIONAL LIBRARY, PRISTINA, KOSOVO. It's hard to know whether the honeycomb-pattern mesh that coats the outside of this library enhances or worsens this bizarre structure. It's been said that when the building first opened, some thought the giant net-like feature was actually scaffolding / Flickr user Nevermind This

8. MICHAEL LEE-CHIN CRYSTAL, ROYAL ONTARIO MUSEUM, TORONTO, CANADA. What I.M. Pei's pyramid is to the Louvre, so is the relatively new Michael Lee-Chin Crystal to the Royal Ontario Museum. While many praise the glass structure, just as many are troubled by the incongruity to the original, more traditional museum that still sits directly beside / Flickr user OliverN5

7. MARKEL BUILDING, RICHMOND, VIRGINIA, US. Although it sounds like urban legend, this futuristic building was inspired by a baked potato served to the architect during a dinner for the American Institute of Architects / Flickr user Rvaphotodude

6. PETROBRAS HEADQUARTERS, RIO DE JANEIRO, BRAZIL. A cross between a penitentiary and an unfinished Lego creation is one member's description of this dreary, block-like structure which occupies a prominent place in the city's downtown area. To make matters worse, exterior slats give the illusion that the building is actually falling apart / Flickr user Rodrigo Soldon

4. CENTRE GEORGES POMPIDOU, PARIS, FRANCE. When looking at the primary colour-coded ducts constructed on the outside of this modern art museum, one quickly sees why these elements are usually hidden / Flickr user Geoftheref

3. 'THE BEEHIVE', WELLINGTON, NEW ZEALAND. A slide projector that fell on a wedding cake that fell on a waterwheel is one description of the Executive Wing of the New Zealand Parliament Buildings, also known 'The Beehive'; Its proximity to the neighbouring Edwardian neo-classical Parliament House only accentuates its unattractiveness / Supplied

1. MORRIS A. MECHANIC THEATRE, BALTIMORE, MARYLAND, US. Looking at the grim, impersonal facade of this once-thriving theatre, it's hard to believe its stage once hosted the likes of Katherine Hepburn and George C. Scott. Although it would be ugly without them, the windows boarded up with wood certainly don't help matters. Its doors now closed, many locals feel the final curtain should have come down on this building long ago / Flickr user Allie Caulfield