Heimdall's Observatory (Earth-1352)

Heimdall's Observatory was a observatory located outside Asgard, which gives a view on the void beyond the realm. Connected by the Bifrost, the Observatory directs those who wish to venture beyond Asgard using magical energy. From this base, Heimdall manipulates the bridge and looks over those who come from the other Nine Realms, as well as other planets and regions in the universe.

History
The observatory was built on the very edge of Asgard, in front of the stars. Odin then appointed Heimdall for the role of gatekeeper. Heimdall was born with the magical ability of omnipresence, and thus was perfect for the role.

After three Frost Giants attempted to enter at Odin's Vault, Thor saw this as an act of war, and together with his brother Loki, Lady Sif, and the Warriors Three, he traveled to the observatory through the Bifrost, demanding that Heimdall opened their path so they could go to Jotunheim and send the Frost Giants a "message". Obviously astute, he allowed because he wanted to know how the Giants were hidden from his sight.

Later on, when they returned after a new war between the Frost Giants and the Asgardians broke off, Odin banished Thor to Earth from the observatory.