You can cryptographically verify any biometric passport (all Visa Waiver Program countries have them) and most European ID cards with any NFC-capable Android smartphone. They include the holder's name and picture and are signed by the government-controlled CA for that country's identity documents.
Hm, the only thing this app would do for me was optically scan the machine-readable print on the back on my ID-card. Didn't seem to want to do anything with the NFC-chip in it.
