Just when you think you've had enough of looking at antiques and crumbling, faded-glory buildings in San Telmo, El Zanjón proposes a refreshing, unusual look back to the past. Enter this historic mansion, built over 150 years ago, through the unassuming entrance on Defensa to inspect the restored house, after which you will be whisked underground into the amazing labyrinth that once contained an arm of the Rio de la Plata, and, later, tenement houses. Artifacts recovered from these passageways are on exhibit both above and below ground, showing the evolution of the city over the past several hundred years.
- Open Hours: Monday to Friday from 10:00 AM to 06:00 PM, Sunday from 12:00 PM to 05:30 PM
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