There’s no town in Monterrey as such, just a street of a few properties, some of which have been converted or purpose-built as hostels or restaurants. At the top end of this street are the thermal baths, the reason there’s any settlement here at all.The vast baths include two natural swimming pools and a number of individual and family bathing rooms. Luxuriating in these slightly sulphurous hot springs can be the ideal way to recover from an arduous mountain-trekking expedition, but make sure you are fully acclimatized, otherwise the effect on your blood pressure can worsen any altitude sickness. If you’re staying at the wonderful old Real Hotel Baños Termales Monterrey, the baths are free. There’s also an impressive waterfall just ten minutes’ walk behind the hotel and baths.