Ganga Sagar is a large step-tank (baoli) adjacent to the fort complex, one of several historic water bodies that served Jhansi's old city. The tank is a working piece of hydraulic heritage — the step architecture allows access at different water levels through the dry season — and is more interesting than it sounds as an illustration of pre-modern urban water management in a region that faces serious drought.
The tank is popular in the early morning with locals, and the ghats are used for religious bathing. The surroundings are not manicured; this is a functional urban tank in an old neighbourhood, not a garden monument. That's partly what makes it worth visiting — it connects the historical narrative of the fort above to the everyday life of the city below.