It is presumed that the mediaeval tower house of the lords of Pont Zarasino (from Pontresina), which was probably constructed in the 12th or 13th century, is not associated with the Saracen incursions of 952. The name Spaniola (Spagniöl in Romansh = Spanish) appears to be of recent origin and could be derived from a long-forgotten anecdote.

The well-preserved five-cornered tower house, which was restored by the municipality in 1994, was constructed from irregular quarry stone and erratic boulders. The cornerstones have been roughly cut. The cut edge faces the mountain to provide protection against avalanches and falling rocks. The high round-arched entrance and the toilet extension on the second floor are well visible and unique. The groundfloor construction incorporates small air holes, the second and third floors narrow embrasures, and the fourth floor a four-cornered window. It is no longer possible to establish whether or not the Spaniola tower was connected to a house via underground access.