Volcanoes—lava and mud, active and dormant

Costa Rica, March–April

Sicily, March–August

Nicaragua, all year round

Costa Rica, January–April

Argentina, October–April

Costa Rica, September–October

New Zealand, September–April

Guatemala, November–April

Alaska, June–August

Myanmar, November–February

Panama, December–April

Hawaii, all year round (best in November–March)

Java, June–August

Yellowstone National Park, May–October

Romania, September–November | March–May

Chile, December–February | June–August

Iceland, May 15–October 15

Philippines, October–June

California, May–October

Canary Islands, all year round

Java, April–October

Java, May | August– November

Java, June–September

Java, May–October

Santorini, April–October

Indonesia, May–October

California, mid-June–September

Hawaii, all year round

Oregon, late July–October