Castillo de San Jorge

This underground archaeological site sits beneath Triana's market, revealing the actual foundations and prison cells of the Spanish Inquisition's castle that operated here from 1481 to 1785. You'll walk through excavated stone cells where prisoners were held, see original foundations, and explore exhibits that explain how the Inquisition functioned as both religious tribunal and political tool. The displays include artifacts found during excavation and detailed information about daily life in the prison.

The visit feels surprisingly intimate and sobering. You descend into the actual excavated ruins, walking on glass platforms above the original floor levels while peering into cramped cells through protective barriers. The lighting is dim and atmospheric, and information panels in Spanish and English explain what each space was used for. The temperature stays cool year round, and the acoustics make everything feel hushed and reverent.

Most travel guides oversell this as a major attraction, but it's really a specialized interest site that history buffs will appreciate more than casual visitors. The entire space is quite small and you can see everything meaningful in 30 minutes despite the suggested 45 minute duration. Entry is completely free, which makes it worth a quick stop if you're already exploring Triana, but don't cross the city specifically for this unless you're particularly interested in Inquisition history.