NYC Roam: 3D world with real transit and building data (nycroam.com)

An explorable Manhattan built from real map & transit data. Ride any subway, bus, or bike along its true routes & stops, or take helicopter mode and fly above the city to explore.

Walk up to any building's address plaque for its story Wikipedia info & link to historical photos from Old NYC.

This is a cool idea, but even more than playing it and learning about NYC, I'm curious to know how you built it, and where the data came from.