Architect Liz Ogbu  has seen the pain gentrification creates for displaced communities. She wonders how we can create ways for longtime residents to stay and reap the benefits of gentrification.

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 OluTimehin Adegbeye  says that in the world's megacities, the most vulnerable get left behind -- including in her city, Lagos. But it's these people, she says, that most deserve space in modern cities.

Architect Vishaan Chakrabarti says many modern cities feel cold, austere, and anonymous. He advocates for designing more vibrant and inclusive cities that are reminiscent of the scale of older cities.

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As Albuquerque's mayor, Richard Berry tried a new approach to addressing panhandling: offering work and connecting homeless with city services. He says it's a more humane option more cities can try.

In 2009, Drew Philp bought an abandoned house in Detroit and worked with neighbors to fix it up. He discovered the power of 'radical neighborliness' to rebuild his struggling neighborhood.

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