Final answer:
The first phase of the High Line, an elevated urban park in Manhattan, opened in 2009.
Step-by-step explanation:
The first phase of the High Line opened in 2009. The High Line is a public park built on a historic freight rail line elevated above the streets on Manhattan’s West Side. Its development was a significant undertaking that transformed an unused industrial conveyance into a dynamic urban green space. Notably, the years leading up to its opening involved extensive planning, design, and community involvement. The work paid off when the first section, running from Gansevoort Street to 20th Street, welcomed visitors in 2009, becoming a popular destination for both New Yorkers and visitors alike.