Art gives former station in US capital new lease of life

A quirky art installation featuring 650,000 plastic balls is breathing new life into a dingy and long-forgotten former underground trolley station in the heart of the US capital.

Through June 1, the expanse below Washington's bustling Dupont Circle is being transformed into a hands-on show where visitors young and old can get creative.

"They invite you to build your own thing and to make it interactive," says Holly Joseph, who came in from the suburbs to check it out and leave her mark.