In Norse Mythology the bridge leading from the realm of the mortals Midgård to the realm of the gods Asgård. The bridge itself is the rainbow and its guardian is the god Heimdall. The bridge is destroyed at the end of the world, Ragnarok. It as built by the Aesir.
... and explorer.
Samuel de Champlain, (c. 1567-1635), established the French colony in Canada; discovered the Great Lakes
William Clark, (1770-1838), with Meriwether Lewis ...