Castillo San Cristobal: Massive Tunnels & Atlantic Viewpoints
★4.6(1673)
Walk the massive 27nd-acre defense line that protected San Juan for centuries. The tunnels are the real highlight here, staying cool while you explore the underground network. Skip the midday sun and head to the top observation deck around 4:30pm for views of the bay and El Morro without the heat stroke. If you want the deep lore, book a local walking tour covering both castles; otherwise, ninety minutes is enough for a self-guided stroll.
Address: 501 Calle Norzagaray, San Juan, Puerto Rico, 00901
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