Wikimedi'Òc

Speckled Trout in underground stream -- Skyline Caverns, Front Royal, Va.jpg - File Upload Bot (Magnus Manske)

Colossal cave near Tucson, Arizona (65319).jpg - Junkyardsparkle

Crystal Sea and Sunken City in Ohio Caverns (70185).jpg - Junkyardsparkle

Entrance building of Ohio Caverns (70187).jpg - Junkyardsparkle

Ohio Caverns (70188).jpg - Junkyardsparkle

Pathway through the Palace of the Gods in Ohio Caverns (70186).jpg - Junkyardsparkle

Bridal Altar, Great Onyx Cave, KY (63591).jpg - Junkyardsparkle

The Colonnade, Great Onyx Cave, KY (63590).jpg - Junkyardsparkle

Drapery Dome, Great Onyx Cave, KY (63588).jpg - Junkyardsparkle

Gypsum Feathers, Great Onyx Cave, KY (63589).jpg - Junkyardsparkle

Hanging Gardens, Great Onyx Cave KY (63594).jpg - Junkyardsparkle

The Original Frozen Niagara, Great Onyx Cave, KY (63595).jpg - Junkyardsparkle

River view, 360 ft. below ground level, Great Onyx Cave, KY (63592).jpg - Junkyardsparkle

The Virgin Mary, Great Onyx Cave, KY (63593).jpg - Junkyardsparkle

Greetings from Polar Caves, in the White Mountains near Plymouth, New Hampshire (73057).jpg - Junkyardsparkle

Crystal Cave Pennsylvania's greatest natural underground wonder, Crystal Cave Company, Inc., Kutztown, Pa (67197).jpg - Junkyardsparkle

The ear of corn, Indian Echo Caverns, Hummelstown, Pa., near Harrisburg, Pa (74069).jpg - Junkyardsparkle

Greetings from famous Crystal Cave, Pennsylvania (K-10326).jpg - Junkyardsparkle

Lost Cave, Hellertown, Pa., crystals in new room (71560).jpg - Junkyardsparkle

Lost River Caverns (Lost Cave) Hellertown, Pa (80485).jpg - Junkyardsparkle

Lost River Caverns (Lost Cave) Hellertown, Pa., crystal ball room (72675).jpg - Junkyardsparkle

Lost River Caverns (Lost Cave) Hellertown, Pa., crystal village (72681).jpg - Junkyardsparkle

Lost River Caverns (Lost Cave) Hellertown, Pa., ear of corn (72674).jpg - Junkyardsparkle

Lost River Caverns (Lost Cave) Hellertown, Pa., long bridge over the river (72673).jpg - Junkyardsparkle

New entrance to the famous Crystal Cave, Kutztown, Pa (80880).jpg - Junkyardsparkle

Onyx Cave (85595).jpg - Junkyardsparkle

Rainbow room, Indian Echo Caverns, Hummelstown, Pa., near Harrisburg, Pa (74062).jpg - Junkyardsparkle

Cudjos Cave entrance and souvenir shop, Tenn. -- Va. -- Ky (79541).jpg - Junkyardsparkle

Hall of Dreams, Ruby Falls, Lookout Mountain Caves (67683).jpg - Junkyardsparkle

Pillar of Hercules -- Cudjo's Cave, Cumberland Gap, Tenn. -- Va. -- Ky (79533).jpg - Junkyardsparkle

Ruby Falls, 145 Ft. high, 1120 Ft. below surface of Earth, Lookout Mountain Cave, Chattanooga, Tenn (67682).jpg - Junkyardsparkle

Dry Cave, Bainbridge, Ohio - DPLA - 6b28b8310da90bfd7641322f370ff2ed (page 1).jpg - DPLA bot

Interior of Cave, Ocean Beach, San Diego, California.jpg - Candypaint1