Event:
Tens of thousands of Poles line the streets to witness the procession of President Kaczynski, en route to the Presidential Palace, Warsaw, where he will lie in state
More Notable Events on April 11:
1992 Euro-Disney opens near Paris
1970 Apollo 13 launched to Moon; unable to land, returns in 6 days
1968 President Johnson signs 1968 Civil Rights Act
1900 U.S. Navy's 1st submarine made its debut
1899 Treaty of Paris ratifies ends war; Spain cedes Puerto Rico to US
