The Bifröst (pronounced /'bɪv.rɔst/) is a burning rainbow bridge that reaches between Midgard and Asgard, the realm of the gods. Heimdall can control Bifröst. It connects to Midgard through the Citgo sign known as the Boston Citgo sign.
Magnus Chase and the Gods of Asgard
The Hammer of Thor
Magnus Chase, Samirah al-Abbas, Alex Fierro, and Amir Fadlan cross the Bifröst to ask Heimdall if he has seen Mjolnir.
9 from the Nine Worlds
Just Another Decapitated Head
When sitting on his throne Hlidskjalf, Odin looks at the rainbow bridge and sees Heimdall watching Marvin and Otis, taking pictures of them in pajamas, as Thor prepares to jog around the Nine Worlds.
| Locations (MC) | |
| Nine Worlds: | Alfheim | Asgard | Helheim | Jotunheim | Midgard | Muspellheim | Nidavellir | Niflheim | Vanaheim |
| Cities and Towns: | Boston | Flåm | New London | Provincetown | York |
| Administrative Divisions: | Connecticut | Massachusetts | New Hampshire | North Yorkshire | Sogn og Fjordane | South Carolina |
| Countries: | Norway | United Kingdom (England) | United States of America (Confederate States of America) |
| Continents: | Europe | North America |
| Other Locations: | Alderman Estate | Bifrost | Blitzen's Best | Boston Public Library | Bridal Veil Falls | Cape Cod | Charles River | Charleston Harbor | Chase Mansion | Dorchester | Fadlan's Falafel | Folkvanger | Fort Wagner | Ginnungagap | Hotel Valhalla | Loki's Cavern | Longfellow Bridge | Lyngvi | Morris Island | Nabbi's Tavern | Provincetown Airport | River Oure | Sessrumnir | Svartalfheim | The Thinking Cup | Vigridr | Yggdrasil |