This is the sculpture at millenium park in the city of Chicago.  It is called Cloud Gate-better known as the bean by locals.

Cloud Gate is British artist Anish Kapoor's first public outdoor work installed in the United States.

The 110-ton elliptical sculpture is forged of a seamless series of highly polished stainless steel plates, which reflect Chicago’s famous skyline and the clouds above. A 12-foot-high arch provides a "gate" to the concave chamber beneath the sculpture, inviting visitors to touch its mirror-like surface and see their image reflected back from a variety of perspectives.

Inspired by liquid mercury, the sculpture is among the largest of its kind in the world, measuring 66-feet long by 33-feet high. 

This photo was taken just as the lights came on in the city so as to retain the detail of the sculpture and also show the lights of the city.