Into the Dark: A Descent Through Carlsbad Caverns

The desert above Carlsbad gives no hint of what waits below. Then the ground opens, the trail switchbacks into cool darkness, and within minutes you're descending into a cathedral of stone that took millions of years and a trickle of acidic water to carve.

Two ways down

You can ride an elevator straight to the Big Room, or you can walk in through the Natural Entrance, dropping 750 feet on a paved switchback as the light fades behind you. Walk in if your knees allow — the transition from sun to gloom is the whole point.

Underground, the silence has a texture — it presses in gently from every wall.

The Big Room

At the bottom waits a chamber large enough to swallow several football fields, hung with stalactites and ringed by formations named for their shapes. A mostly level loop trail lets you take it slowly, and slowly is the only sensible speed.

Stay for the bats

From late spring through October, hundreds of thousands of Brazilian free-tailed bats spiral out of the Natural Entrance at dusk. Rangers give a talk beforehand; phones must be off. It is one of the great wildlife spectacles in the Southwest.

Field notes

• The cave holds a steady 56°F year-round; bring a light layer.
• Wear real shoes — the paths are damp and can be slick.
• Reserve timed-entry tickets in advance during summer.

Climbing back into the desert sun feels like surfacing from a dream — one written in limestone and measured in millennia.