
Welcome to “The Rotunda”. We are now approximately 140’ below the surface. To the right are two Great War Monuments dedicated in 1922 and 1929. This massive room is ¼ of an acre in size with a circular ceiling, and is the result of rivers that once flowed through these passages, carving away the limestone rock. Over time the water found cracks and weak spots in the layers, slowly making its way deeper into the layers. The unsupported rock gave away and settled to the floor, creating a natural breakout dome. In addition to leaving behind large passageways, the rivers left a thick layer of sediment on the cave floor.
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Itineraries across USA

Acadia

Arches National Park

Badlands

Big Bend

Biscayne

Black Canyon Of The Gunnison

Bryce Canyon

Canyonlands

Capitol Reef

Carlsbad Caverns

Channel Islands

Congaree

Crater Lake

Cuyahoga Valley

Death Valley

Dry Tortugas

Everglades

Gateway Arch

Glacier

Grand Canyon

Grand Teton

Great Basin

Great Smoky Mountains

Guadalupe Mountains

Haleakalā

Hawaiʻi Volcanoes

Hot Springs

Indiana Dunes

Isle Royale

Joshua Tree

Kenai Fjords

Kobuk Valley

Lassen Volcanic

Mammoth Cave

Mesa Verde

Mount Rainier

North Cascades

Olympic

Petrified Forest

Pinnacles

Rocky Mountain

Saguaro

Shenandoah

Theodore Roosevelt

Virgin Islands

Voyageurs

White Sands

Wind Cave

Yellowstone

Yosemite

Zion