London stands on the north bank of the Thames, at the lowest point where the river can be bridged.
In 1176, work began on a new, stone bridge, a little to the west of existing wooden one. Completed in 1209, the new bridge is impressive structure, with nineteen arches. Numerous dwellings and shops between three and seven stories high will sit on the bridge itself. It's a fashionable shopping area and even a place of pilgrimage - Peter of Colechurch established a shrine to St. Thomas Becket in the exact centre of the bridge.
This much, the mortal world knows. What they don't realize is that much of the business transacted on the bridge does so under the thumb of the supernatural world. Cainites own or partly-own many of the shops. A small Tremere chantry lies at one end of the bridge, and an unusually ecumenical Mage chantry open to many magical Fellowships lies at the other.
The Mages are interested in the bridge because, somewhat to their surprise, they discovered that it was a place of mystical power, a symbolic crossing-point where the different realities of the city converge. Even the Cainites have taken to referring to it by the name the Mages use for it, "Night's Bridge", and both the Tremere and Mage chantries boast larger - and more confusing - interior dimensions than their exterior appearance would suggest.