El Zanjón de Granados in San Telmo offers a fascinating glimpse into a very different side of…read moreBuenos Aires--hidden tunnels, restored ruins, and layered history beneath the city streets. The guided tour was especially memorable thanks to an energetic and engaging young guide who brought the space to life with great storytelling. It felt intimate and unexpected, like discovering another city under the one you think you know. Definitely worth visiting if you want a more unique, off-the-beaten-path experience in Buenos Aires. Also thankful for AC on a hot day outside.