Samudra Koop & Ulta Qila Temples, Jhusi

Cross the Ganga from Prayagraj to the eastern bank and you arrive at Jhusi, the ground of ancient Pratishthanpur — by tradition the capital of the Chandravanshi (Lunar) line and the tapasya-ground of King Pururavas and the celestial Urvashi.

• Rising over this floodplain is a great earthen mound long known as the Ulta Qila, the "inverted fort", whose weathered ramparts and buried layers make it one of the most evocative archaeological landscapes around the Sangam.
• Tucked into this mound is the Samudra Koop, an old stone-lined well — reported to be roughly twenty-two feet across — whose slightly saline, never-drying water gave rise to its name, the "ocean well".
• The Archaeological Survey of India lists the site among its protected monuments, and standing at the well's mouth, with the river haze on one side and the ruin-strewn slopes on the other, you feel the deep time of this crossing place.
• Ringing the well is a quiet cluster of antique shrines that draw a steady trickle of local devotees rather than crowds.
• There is a modest Ram-Janaki temple, a south-facing Hanuman shrine (the auspicious dakshinmukhi form), a set of Vishnu padukas (sacred footprints), and a Shiva lingam, alongside small caves that tradition ties to the penance of Pururavas and Urvashi.
• None of it is grand or gilded; the appeal is the layering of living faith over genuinely ancient stone.
• Photographers love the low light on the mound; history-minded travellers come for the tangible sense of Pratishthana beneath their feet.
• Dress modestly, remove footwear at the shrines, and treat the ASI-protected structures with care — do not climb or scratch the old masonry.