Cruceta del Vigía
Across the street from Castillo Serrallés is Cruceta del Vigía ($6, $3 students and seniors, includes admittance to Castillo Serrallés and the gardens), an enormous concrete cross with an observation deck built in 1984. It marks the site of a Spanish lookout station established in 1801 to watch over the Ponce harbor.
At that time, a crude wooden cross was erected on the site that remained there until it was destroyed in 1998 by Hurricane Georges. The cross was used as a flag-signaling system to alert troops to the arrival of merchant ships in the harbor. If a white flag was raised, it meant the harbor was under possible attack.
© Suzanne Van Atten from Moon Puerto Rico, 2nd Edition