The river that hides beneath the city
The Darro has a peculiar trick. Walk south from the Alhambra and you find the river in full light, running between stone banks. Cross into Plaza Nueva and it vanishes — channelled underground in the 19th century to create the square above it. A few metres further east, at the mouth of Carrera del Darro, the river surfaces again and keeps going. That disappearing act tells you something about how Granada layers its history: Arab foundations under Renaissance stone under 19th-century interventions, all running alongside each other.
Carrera del Darro is the best street in the city for architecture photography. Medieval bridges cross the water every hundred metres, the buildings on both banks date to the 16th and 17th centuries, and the Alhambra wall rises on the hill directly to the south. Walk it before 09:00 and you may have it to yourself. By 11:00 the tour groups have arrived and the narrow footway fills up. The light in the morning comes from the east, catching the stonework cleanly.
The oldest building on the route
At Carrera del Darro 31, El Bañuelo is the oldest structure you'll pass on this walk: an 11th-century Moorish hammam, pre-dating the Alhambra itself. The entry fee is €3–5 and it takes about 20 minutes. What makes it worth stopping for are the star-shaped holes cut into the vaulted brick ceilings — in the morning light they cast sharp, shifting pools across the columns below. Most visitors give it a cursory look; the right approach is to stand still and let your eyes adjust to the dark.
Casa de Castril, a few metres further along at number 43, is a 1539 Renaissance palace with a Plateresque portal — carved stone work above the doorway so dense and figurative that people stop mid-stride on the pavement. It's Granada's archaeological museum now. Entry is €1.50 (EU citizens free).
Paseo de los Tristes as an evening ritual
The Carrera del Darro opens into Paseo de los Tristes — properly called Paseo del Padre Manjón — a wide promenade lined with plane trees and café terraces. The Alhambra fortifications rise directly above from here, the cliff face visible through the trees. In the early evening, between 17:00 and 19:00, this is where Granada residents come: cold beers at the terrace tables, children running on the wide pavement, the Alhambra walls turning from sand-gold to a darker amber as the light drops. It's one of those places that gets described in guidebooks as 'magical' and that description, for once, isn't entirely wrong.
The walk ends at Cuesta del Rey Chico, the wooded path that climbs the Alhambra hill. From here you can turn back along the Darro, take the climb if you have a timed entry ticket, or continue uphill through the Generalife gardens. The outbound route from Plaza Nueva to here is 2.8 km and almost completely flat — the Carrera del Darro and the Paseo run level with the river the whole way.