One of the best excursions from Alghero is to Neptune’s Grotto (daily: April & Oct 10am–6pm; May–Sept 9am–8pm; Nov–March 10am–4pm; last tour 1hr before closing), a dramatically lit marine cave with stalagmites and stalactites. Boat trips to the grotto leave from Alghero’s port between March and October. Before buying tickets, check with the operator that you’ll be able to visit the grotto on that day, as you can’t enter if the sea is too rough – and if the winds are up, be prepared for a choppy ride (40min). Alternatively, local buses depart from the Alghero’s Giardini Pubblici (1–3 daily), leaving you at the top of a long and steep flight of steps that corkscrews down to the cave mouth.

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