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Ugliest Buildings

10. Royal National Theatre; London, U.K. Yes, Shakespeare wrote that "All the world's a stage..." but he might not have had he lived to see 1970s. While we love the idea of the theatre and the world-class productions mounted here, our feelings don't quite extend to the actual building.

Top 10 "ugly" buildings to visit

A recent opinion piece in the New York Times resurrected the age-old debate about whether ugly buildings deserved preservation if deemed historically important. While the staff and travelers at online travel advisers Trippy.com (www.trippy.com) may be undecided on that issue, they can certainly tell you which buildings they'd put on the list for consideration. Here are their choices for the World's Top 10 Ugliest Buildings. Reuters has not endorsed this list: