Photo by Getty Images Calatrava Sued Over High Costs on Spain's Valencia Opera House The Spanish city of Valencia is suing the architect Santiago Calatrava and his firm over the high maintenance costs for the city's opera house, which Calatrava designed. Just eight years after opening, the opera house is starting to show signs of aging. The latest incident involves many of the building's mosaic tiles being torn off by high winds, which led the owner to close the venue to the public and cancel performances. Earlier, the building was subject to flooding after heavy rainfall. On that charge, Calatrava
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.