The Hidden Melodies of Subways Around the World - The New York Times

When train doors close, these jingles warn riders to stand clear.

REACH: New York – New York, New York - Atlas Obscura

What are the Times Square fake Subway grates in New York City?

For 2 Graffiti Artists, New York's Subway Was Irresistible and Deadly - The New York Times

The Case for the Subway - The New York Times

Failing New York Subway? Not Always — Once There Were Chandeliers - The New York Times

12 Secrets of the New York Subway, Travel

Along a Subway Line's 31 Miles, Nagging Crime Fears Test Riders' Resolve - The New York Times

Underground' Digs Up The Secrets Of Hidden Communities Around The World : NPR

The Secret Subway by Corey, Shana

Inside the graffiti-covered 191st Street tunnel, NYC's deepest subway and only underground 'street

Atlas Obscura - Curious and Wondrous Travel Destinations

Art and 3-D Magic in a German Subway - The New York Times

Hell on Wheels by Willy Spiller Is a Look at '70s and '80s Subway Life - InsideHook