A special, curated walk with local expert Marc Zimmermann. Up to 6 people (12 years +) will visit remnants of the late 1800s underground railway terminus, clandestine knights' sally ports, traces of a WW2 shelter, and catch glimpses of historic water cisterns, to conclude at a hidden, formidable 1700s defence installation. The 2km walk begins at City Gate and ends at Auberge de Baviere, Valletta taking approx 90 - 120 minutes. Reasonable mobility required (100+ steps plus moderate slopes); some sections not wheelchair accessible. This tour is not available to the general public making it a truly special event. Date to be mutually agreed. Donated by Marc Zimmerman.