All that remains is the Chapel. The fort was actually about 2-3 acres big, quite an area for 180 men to protect. When the Mexican army left the area after their defeat, they blew up the fort, except for the Chapel.
The question is, was Travis and Bowie originally sent there to blow it up or fortify it as some claim?
And through the center of the fort developed a dusty road traveling in front of the famous Chapel facade. That eventually turned into a paved road and is now a busy city street in downtown San Antonio. A lot of people don't know they are driving over the ground where Travis and Crockett died.
The current park is really "inside out" from the original fort. The Chapel, the center of mission life, faced in to the compound, now it faces out to the street.