Developers look to create underground park in New York City

Visitors from around the world are drawn to New York City's High Line, an elevated park built on defunct railroad tracks transformed into an urban sanctuary of flowers, grasses and trees.

Private planners inspired by the High Line's success are now looking deep under Manhattan at a proposal to create the Lowline, billed as the world's first underground park.

The project would occupy a 116-year-old abandoned trolley terminal below the Lower East Side that's been used for storage since 1948.