Poás is one of Costa Rica´s most active volcanoes, and the rain-fed sulphuric pool emits smoke and steam. 

The weather here can change in an instant, so make sure to take photos quickly if you have a clear view of the crater. 10 minutes after I took this photo, clouds and fog covered the area and completely obstructed the view.
Poás is one of Costa Rica´s most active volcanoes, and the rain-fed sulphuric pool emits smoke and steam. 

The weather here can change in an instant, so make sure to take photos quickly if you have a clear view of the crater. 10 minutes after I took this photo, clouds and fog covered the area and completely obstructed the view.
Morning at Poas Volcano!!!
the color changing crater lagoon
Volcan Poas' crater.  Nice daytrip from San Jose to see Volcan Poas and La Paz waterfall