Mitchelstown Cave

Ireland

Moncks Cave

New Zealand

Mud Caves

United States

Murrawijinie Cave

Australia

Mystic Caverns and Crystal Dome

United States

33.5 m deep

Naj Tunich Cave

Guatemala

Natural Stone Bridge and Caves

United States

Natural Trap Cave

United States

25.9 m deep

Nelson Bay Cave

South Africa

Niagara Cave

United States

61 m deep

Niah Caves

Ojo Guareña

Spain

Palace Cave

Pamitinan Cave

Philippines

Peak Cavern

United Kingdom

Pech Merle

France

Pettyjohn Cave

United States

Pešna

North Macedonia

Pindaya Caves

Myanmar

Poço Encantado

Brazil

Rajko's Cave

Serbia

Redmond Caves

United States

Reservoir Hole

United Kingdom

Rock Dove Cave

United States

Saalfeld Fairy Grottoes

Germany

Sandy Glacier Caves

United States

Schellenberg Ice Cave

Sea Lion Caves

United States

Seneca Caverns

United States

Shatter Cave

United Kingdom

Shenandoah Caverns

Sibudu Cave

South Africa

Sibyl's Cave

Italy

Smoo Cave

United Kingdom

Snezhanka

Bulgaria

Speedwell Cavern

United Kingdom