Editor's note: A May deadline looms as just one flash point in a political showdown between Homeland Security and states that oppose Real ID demands. This is the second in a four-part series examining the confrontation.
The nation's capital attracts more than 15 million visitors a year, mostly leisure travelers who often make their way to the city's official visitor center, which is conveniently located downtown in a corner of the Ronald Reagan building.
Or was that inconveniently located? Starting May 11, Americans living in states that don't comply with new federal regulations could be barred from entering Washington D.C.'s visitor center and collecting the complimentary maps and brochures--unless they happen to bring a U.S. passport or military ID with them.
How many more REAL ID zones will there be?
Read more here.