1 | GUATEMALA CITY, GUATEMALA
This fumes-and-crime-filled city is the capital of an otherwise beautiful country. It looks more like a slum than a capital city, with most buildings appearing on the verge of collapse.
2 | MEXICO CITY, MEXICO
It's currently known as one of the world's most dangerous cities, but even if it was a safe haven, it still would not be a very inviting city. It's one of the world's most polluted and there isn't much to look at.
3 | AMMAN, JORDAN
The capital of the country with one of the world's most fascinating historical sites (magical Petra) should simply be an arrival and departure point on your travel itinerary. Unless you enjoy dirty, chaotic streets and ugly buildings looking like they're crumbling on top of each other.
4 | CARACAS, VENEZUELA
Venezuela is known for its extraordinary success at international beauty pageants and Venezuelan women are famous for their plastic surgery-enhanced bodies, but the country's capital sure is no beauty. Not only is it surrounded by shantytowns, its most central districts seem devoid of planning and style.
5 | LUANDA, ANGOLA
It's undergoing a spectacular boom as the capital of Africa's recent economic success story, but let's hope the new development creates something more attractive than what we see now: ugly apartment buildings dotting the skyline of what incredibly is the world's most expensive city.
6 | CHISINAU, MOLDOVA
Moldova's capital is an eyesore. It's an industrial city mostly made up of very ugly Soviet-style apartment buildings, most of them decaying (and not very clean either). There are many unattractive Soviet-era cities in Eastern Europe, but we expect more from a capital.
7 | HOUSTON, USA
Houston, we have a problem: You're ugly. This is the United States' fourth largest city when it comes to population, but the attraction sure isn't scenery. There are many other ugly American cities (let's face it -- American metropolises aren't exactly beauties: Atlanta, Cleveland...), but this one should win the title of ugliest of them all, with a large impoverished and homeless population (close to one in five families live below the poverty line) and a cityscape with no formal zoning regulations.
8 | DETROIT, USA
Here's the ugly truth: Detroit is ugly. Not just aesthetically but also in quality of life, which explains why it lost a quarter of its population in a decade. One of the highest crime rates in the country may have contributed to that, but this is also a dirty, rundown city mostly made up of brick, concrete and glass. Not pretty.
9 | SÃO PAULO, BRAZIL
Nature seems to have concentrated all of its efforts on Rio and completely forgotten Brazil's other big metropolis. São Paulo may be one of the world's most exciting cities when it comes to dining and shopping, but there's no question that it's one big ugly concrete jungle.