And worshipping the Pitris and the celestials, one obtains the fruits of Ashvamedha sacrifice. There is a a very inaccessible Tirtha, called Ishanadhyushita.
अर्चयित्वा पितृन् देवानश्वमेधफलं लभेत्। ईशानाध्युषितं नाम तत्र तीर्थं सुदुर्लभम्॥