The Alamo is a "must see".

More than 2.5 million people a year visit the 4.2 acre complex known worldwide as "The Alamo". Most come to see the old mission where a small band of Texans held out for thirteen days against the centralist army of General Antonio Lopez de Santa Anna. Although the Alamo fell in the early morning hours of March 6, 1836, the death of the Alamo Defenders has come to symbolize courage and sacrifice for the cause of Liberty. The memories of James Bowie, David Crockett, and William B. Travis are as powerful today as when the Texan Army under Sam Houston shouted "Remember the Alamo!" as it routed Santa Anna at the battle of San Jacinto on April 21, 1836. Just a short walk from the River Walk. Admission to the Alamo is free.