San Juan turned 500 in 2021 and the proof is stacked in layers: Ponce de León's 1521 residence, a 1532 Dominican church, an 1854 barracks Spain finished 44 years before losing the island, and a 1929 marble capitol. Three days of walking the evidence.
Built in 1521 as Juan Ponce de León's family compound and held by his descendants for 250 years, this is the oldest continuously occupied residence in the Americas. Rooms hold 16th–19th century furnishings and Taíno artefacts.
Dominican friars began this vaulted Gothic church in 1532, making it the second-oldest in the Americas. Ponce de León lay buried in the crypt for nearly 300 years before being moved to the cathedral. A 17-year restoration reopened it in 2021.
Rebuilt in stone from 1540 after a hurricane flattened the 1521 thatch original, the cathedral holds Ponce de León's marble tomb, moved here in 1913, and the glass-cased body of the martyr San Pío. Some vaulting survives from the 1500s.
The 1635 red gate is the last standing of five in the six-metre-thick sandstone wall; crews off arriving ships walked straight up Caleta de San Juan to the cathedral to give thanks. Paseo del Morro runs 1.2km along the bay beneath the ramparts.
Puerto Rico's domed capitol, opened in 1929 and faced in Georgia marble, keeps the original 1952 Constitution in a bronze-and-glass urn under a mosaic rotunda depicting the island's four centuries. Senate and House chambers flank it.
This compact bastion on the Condado channel, finished in 1788, threw back Ralph Abercromby's British invasion force in 1797 and absorbed shellfire from Admiral Sampson's squadron in May 1898. It covered the eastern approach El Morro could not reach.
Set in a 1920 neoclassical municipal hospital in Santurce, the museum runs 300 years of island art from José Campeche's colonial portraits through Francisco Oller's abolitionist canvases to the 1950s DIVEDCO poster workshops.
The 1837 La Princesa jail held political prisoners until it closed in 1976 and now houses the tourism company, with two restored cells open inside. The promenade below the walls ends at the 1992 Raíces fountain of Taíno, African and Spanish figures.
Laid out in 1863 on the Atlantic cliff beneath the city walls, this walled cemetery holds nationalist leader Pedro Albizu Campos, orator José de Diego and composer Rafael Hernández, arranged around a circular neoclassical chapel.
The Caleta de San Juan townhouse of the mayor who ran San Juan from 1946 to 1968 — the first woman to govern a capital city in the Americas — kept largely as she left it, with her lace fans, ballot boxes and Kennedy-era photographs.
Spain's last great colonial building here, this 1854 three-storey barracks quartered 1,000 troops with their families around a vast courtyard. Upstairs the Museo de las Américas documents African enslavement in Puerto Rico and island craft traditions.
Santurce grew out of Cangrejos, a settlement where freed and escaped Africans were granted land from the 1770s in exchange for coastal defence. Its 1910 market hall still trades yuca and yautía by day before the surrounding streets fill at night.