A canyon of buildings on The Grand Canal, viewed from the shop-laden Rialto Bridge. While I wasn't aware of it when taking this photo, these are the same constructions featured in the "sinking building" scene of Casino Royale.

Navigating over bridges and under buildings to each group of conglomerate structures feels like island-hopping an archipelago, while trying to find a toilet is a tormenting game of following a breadcrumb trail of painted WCs on the stone paths. When you find the treasure, expect to pay hard cash for its use, as is often the case in Europe.