Bigger than you think.
In San Antonio, Texas, the Alamo as it stands today (175 years after the siege) is only a small part of the original compound. Were the original structures still standing, the entire Alamo would cover almost two city blocks. The famous façade which is so familiar today– featured on countless corporate logos and integrated into many modern building entrances– is the chapel at the southeast corner of the compound.
Below is a map showing the oringal layout of the Alamo (oriented north-south). This map is provided courtesy of the University of Texas Libraries, The University of Texas at Austin.