LONDON - The mighty Thames cuts through the center of London, but the city's second river, the Lea, remains mostly hidden from view.

By its banks, in the borough of Newham, far from the well-heeled streets of Chelsea and Hampstead, some of the city's most deprived residents live. Megan Piper decided she wanted to bring some art into their lives.

During her childhood, her parents took her to art galleries, forging a lifelong passion for art that developed into a career. But while working in logistics for a gallery, Piper was struck by how much art was hidden in storage or private collections - art that could be enriching the lives of people who don't get to galleries much.

Now an art dealer, Piper and a friend, Clive Dutton, devised the Line, a project to bring great art outside. Dutton had worked on regeneration projects across East London connected to the London Olympics in 2012.

"I am a born-and-bred Londoner, but there is a black hole in my geography of this part of the city," Piper said. "It's an idea of hidden artworks for hidden waterways."

The Greenwich Meridian Line runs north-south, slicing the globe in two; the sculpture walk Piper and Dutton devised roughly follows the meridian, inspiring the name.

The pair recruited artist Mark Wallinger, winner of Britain's prestigious Turner Prize, to the team as cheerleader, using his profile to lend art-world gravitas to the project. More recently, Carolyn H. Miner, formerly of the National Gallery of Art in Washington, joined the team as curator.

Wallinger is perhaps best known for his 1999 sculpture, Ecce Homo, in Trafalgar Square. The rotating statues there and the intense public engagement with them inspired the sense of public accessibility and ownership behind the Line. A crowdfunding campaign to engage Londoners that followed raised more than $200,000 in initial funding.

My journey along the Line (which takes about three hours to complete) had an inauspicious start at Bromley-by-Bow tube station. It took me a while to find the first piece of work, situated across a busy road and down by the canal.

Network, by Thomas J Price, a nine-foot sculpture of a young black man gazing intently at a cellphone, stands casually next to a playground - reminding us to look up, look around, and interact with the here and now.

As I followed the signs southward, the here and now momentarily seemed to disappear. I had arrived at Three Mills, said to be the oldest tidal mill in Britain, whose buildings date from the 18th and 19th centuries and evoke the era when Dickens roamed London. The House Mill is now home to a visitor center, arts space, and cafe. I was ushered upstairs to view the second artwork on my quest.

The Transfiguration series, an installation by renowned video artist Bill Viola, is the only nonsculpture currently featured on the Line. From the darkness, obscure figures emerge walking toward the viewer and, finally, through a wall of water to confront us with their gaze.

After I viewed the work, the kindly gent in charge gave me some detailed instructions to help me find the next sculpture, as the map that accompanies that walk is a little tricky to follow. The Line website's map now links to Google Maps, making navigation more user-friendly.

I found my way through an industrial estate and back to the River Lea. In front of a huge Amazon logistics building, I was confronted with a comment on consumerism: DNA DL90 by Abigail Fallis, 22 shopping carts arranged in the shape of a DNA helix. In the background lies the capitalist haven of Canary Wharf.

Next stop was the blockbuster: a work by Damien Hirst. And true to form, Britain's Peter Pan of shock art turned to a biology textbook for inspiration to create Sensation, a colorful depiction of a cross-section of human skin.

The sky was darkening, and I seized the chance to stop at Cody Dock, a community project cofounded by local resident Simon Myers, who is also a member of the selection panel for the Line. The project - a garden, a space for local cultural events, and a cafe in a boat - now boasts herons and kingfishers among its visitors. Myers told me that during the first two weeks after the Line was launched (at the end of May), the site had 150 visitors each weekday and about 1,000 each weekend.

Myers hopes the project will reconnect Newham residents with the River Lea and incubate a vibrant art scene like the one in the neighboring borough of Hackney.

A quick trip on the Docklands Light Railway from the Star Lane station brought me to Royal Victoria docks, an area that has been transformed by redevelopment. Buildings reach skyward, and the Emirates Air Line cable car hangs overhead, but another cluster of sculptures drew my gaze back to street level.

In front of the futuristic Siemens building sits Consolidator #654321, by Sterling Ruby, a hunk of red steel. Nearby, Work No. 700, by Martin Creed, three thin metal beams stacked together, stands serenely on the dockside, and Sir Eduardo Paolozzi's Vulcan, a huge cubist figure of a man, stands guard over the wharf.

London's most unusual form of transport, the Emirates Air Line cable car, beckoned me into the clouds. I ascended over the Thames toward The O2, a.k.a. the Millennium Dome, where the cultural regeneration of East London began. My vantage point allowed me to look down on Consolidator #654321 and Antony Gormley's Quantum Cloud, which was commissioned for the Millennium Dome and completed before its opening in 1999. Gormley is best known for his Angel of the North sculpture and his recurring theme of the human form. Indeed, there is a human body at the steel center of Quantum Cloud, but you need to look carefully to see it. The work has joined the Line as part of the sculpture trail.

The O2 is now a popular entertainment venue, hosting concerts. I wandered away from the crowds to the deserted river walk.

There, a second long-established artwork joins the project: A Slice of Reality, by Richard Wilson. Another cross-section, this time of a ship, it shows the living quarters and innards of a vessel.

A signpost indicates that my journey is complete. The last work, Thomson and Craighead's Here, points to London's banking powerhouses just across the Thames. The number on the sign, 24,859, indicates the meridional circumference of the Earth in miles.

The works were chosen by a panel that included Piper, Dutton, Myers, and Wallinger. The first requirement was "excellence," Wallinger said, followed by a need "to be robust enough to exist outdoors for a couple of years, but beyond that, we judged it blind." The Line is by no means complete. The sculptures there now are expected to remain for two years. The plan is that it will evolve, providing additional opportunities to engage local people and to liberate more art.