The City of Arts and Sciences ( ; ) is a cultural and architectural complex in the city of Valencia, Spain. It is the most important modern tourist destination in the city of Valencia and one of the 12 Treasures of Spain. The City of Arts and Sciences is situated at the southeast end of the former riverbed of the river Turia, which was drained and rerouted after a catastrophic flood in 1957. The old riverbed was turned into a picturesque sunken park. Designed by Santiago Calatrava and Félix Candela, the project began the first stages of construction in July 1996, and was inaugurated on 16 April 1998 with the opening of L'Hemisfèric. The last major component of the City of Arts and Sciences, Palau de les Arts Reina Sofía, was inaugurated on 9 October 2005, Valencian Community Day. The most recent building in the complex, L'Àgora, was opened in 2009. Originally budgeted at €300 million in 1991 for three structures, it has expanded about three times the initial expected cost. Buildings and structures The complex is made up of the following buildings and structures, presented in the order of their inauguration: L'Hemisfèric (1998) – an IMAX Cinema, planetarium and laserium. The building is meant to resemble a giant eye, and has an approximate surface of 13,000 m². The Hemisfèric, also known as the planetarium or the "eye of knowledge", is the centerpiece of the City of Arts and Sciences. It was the first building completed in 1998. Its design resembles an eyelid that opens to access the surrounding water pool. The bottom of the pool is glass, creating the illusion of the eye as a whole. This planetarium is a half-sphere in a concrete structure 110 meters long and 55.5 meters wide. The shutter is built of elongated aluminum awnings that fold upward collectively to form a brise soleil roof that opens along the curved axis of the eye. It opens to reveal the dome, the "iris" of the eye, which is the planetarium or Ominax theater. The structure is divided in half by a set of stairs that descend into the vaulted concrete lobby. The underground spaces are illuminated with the use of translucent glass panels within the walking path. The transparent roof is supported by concrete arches that connect to the sunken gallery. There is a remarkable echo in the building and if two people stand at