For a truly unique Azorean experience, head to the natural ocean pool at Ferraria, where geothermal springs heat the Atlantic.

The main spa building is closed, but the real magic is in the free natural cove.

Be prepared for a bit of a trek; due to a rockfall, you'll need to park at the top of the cliff and walk down a steep path for about 5 minutes to reach the water.

TIPS:

• Time your visit with the low tide for the warmest temperatures, and hold on to the ropes in the water as you enjoy the incredible sensation of the hot and cold currents mixing around you. To check the tides, use this website.

• Avoid wearing white when visiting hot springs and thermal baths due to many of them being rich in minerals. The iron, sulfur, and other minerals present in the waters can stain light-colored clothing, and white is particularly susceptible. Over time, these minerals can settle into the fabric and become challenging to wash out completely. The minerals can also generate the elasticity of swimwear over time, so consider using older or dedicated swimwear when frequenting these hot springs and thermal baths.