4/12: Cause of deadly Calif. bus crash could take weeks to find out; The height of artistry deep beneath New York City

Investigators say it could take weeks to even months to determine the cause of a deadly bus crash in California that killed five students, three chaperones, and the drivers of both vehicles; and, one of New York City's great architectural treasures is the old City Hall subway station, which has been shuttered for 70 years. With majestic arches and chandeliers that rival any cathedral, it was one of the many structures built in the city by the Guastavino family, who are being celebrated at the Museum of the City of New York.