Where is Asgard on Earth?

Asgard was one of the Nine Realms and the former home world of the Asgardians. Asgard was destroyed in 2017 during Ragnarök, when Thor ordered Loki to unleash Surtur in order to kill Hela. The surviving Asgardians relocated to Earth, settling in Tønsberg, Norway, reestablishing the town as New Asgard.

Is Asgard is a real place?

No, Asgard is not a real place. In Norse mythology, it was home to the gods. It corresponds to Mount Olympus in Greek mythology.