The Holy Temple

Rav Tzvi Hersh Kalisher, the rav of Thorn, Germany, who had studied as a youth in the yeshivos of Rabbi Akiva Eiger and the Nesivos HaMishpat (Rav Yaakov of Lisa), published a sefer advocating bringing korbanos in the location where the Beis HaMikdash once stood in Yerushalayim. Rav Kalisher considered it not only permissible to offer korbanos before the Beis HaMikdash is rebuilt, but even obligatory.