My pick
My tip“The climb to the castle is short but steep, and the tower stairs are narrow. On Mondays the first half hour is sometimes free. The best photo of the town is from the road coming from the bridge.”
Spain's smallest “city” by title. Its houses cling to the edge of a limestone rock crowned by a castle with a tower that almost hangs over the valley. At its foot is a medieval bridge with a gate tower, where tolls were collected on the River Ebro.
What to see
The castle of Frías and its tower overlooking the valley · the hanging houses (Casas Colgadas) · the fortified medieval bridge over the Ebro · the Cascada de Tobera nearby (3 km) · the church of San Vicente on the edge of the rock
Moderate effort, needs a car
About an hour and a quarter by car from Burgos or Bilbao; no practical public transport. The town is very steep and paved; allow two hours with the bridge.
Address
Parque Alfonso VIII, s/n, 09211 Frías, Burgos