Old San Juan has a lovely colonial architecture. Walking within its streets feels like stepping back into another era. It is a highlight of Puerto Rico and arguably the best destination of the entire island.
It is a rather old city at 500 years and known as the 2nd oldest city in the Americas. The entire area is a UNESCO World Heritage Site, with hundreds of restored colonial buildings. Most are housing today fancy art boutiques and dining and shopping places.
The main attraction is the fort known as El Morro Fort, and formally called Castillo San Felipe del Morro. It is a short walk 15 minutes walk from the city center.
Other notable sites in old San Juan include the Fortaleza; the Castillo de San Cristóbal (San Cristóbal Fort) with stunning views of the city; and the San Juan Cathedral.
