Cuba's oldest tourist attraction, according to local propaganda, lies 5km southeast of Matanzas and is 300,000 years old. There are 2500m of caves here, discovered in 1861 by a Chinese workman in the employ of Don Manuel Santos Parga. The entrance is through a small museum, and a 45-minute Cuevas de Bellamar visit leaves almost hourly starting at 9:30am. The caves on show include a vast 12m stalagmite and an underground stream; cave walls glitter eerily with crystals.
Well-maintained, well-lit paths mean it's easy for kids to imbibe the stupendous geology, too. Outside the Cuevas de Bellamar are two restaurants and a playground.
It's 5km from central Matanzas – you can walk, take a taxi or hop on bus 12 from Plaza Libertad.