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<em>Orfelia fultoni</em> are the only bioluminescent fly species in North America, and the larvae produce the bluest light in the insect world.
caves

Meet the Glowing 'Worms' of the American South

There is a lot to learn about Orfelia fultoni, the only bioluminescent fly in North America, but its larvae put on a show.
Maggie Gigandet August 18, 2023
Theopetra, Greece

The Cave of Theopetra

Some of the secrets of human origin are revealed at this museum.
Terceira Island, Portugal

Algar do Carvão

One of few vertical lava tubes in the world accessible by foot.
Horse Cave, Kentucky

Hidden River Cave

Once one of the most polluted caves in America, now an environmental success story and a museum dedicated to caves.
Scientists explore the lava tube they have dubbed the "Red Cave" for its rusty hues.
subterranean

Taking the First Steps Into a Newly Formed Volcanic Underworld

More than a year after a devastating eruption in the Canary Islands, a team is exploring a braided network of still-hot lava tubes.
Maya Wei-Haas July 19, 2023
Silhouettes of bats flying around the Phoenix Bat Cave.
List

21 Places to Get Closer to Bats

Often misunderstood creatures, bats are vital members of their home ecosystems.
Jonathan Carey July 14, 2023
Aki, Japan

Ioki Cave

Over 40 species of fern cover the canyon walls of this lush green bowl, cut off from the bustle of the world by a cave entrance.
Mérida, Mexico

Cenote Ka' Kutzal

A cenote sitting in the middle of a parking lot shows the Yucatán Peninsula at its most urbanized.
Miskolc, Hungary

Miskolctapolca Cave Bath

The only natural cave bath in all of Europe.
Conca dei Marini, Italy

Grotto dello Smeraldo

A limestone grotto where daylight filters in from below and turns the water a beautiful turquoise. Also home to a small underwater nativity scene.
North, Arkansas

Cosmic Cavern

The warmest cave in the Ozarks features two seemingly bottomless lakes.
Inside one of the massive chambers
Bristol, England

Clifton Suspension Bridge Vaults

Cathedral-like Victorian vaults are hidden within this iconic bridge.
This seems like a perfectly reasonable way to decorate a home in a fancy neighborhood. Maybe?
lighthouses

Wonder Is Everywhere: A Fight Over Optimus Prime, the Richmond Rat Boy, and More From Around the Web

Get a peek into what we’re obsessed with right now.
April White June 9, 2023
Maquoketa, Iowa

Maquoketa Caves State Park

A wonderland of caves in eastern Iowa.
Video

All Roads Lead to Texas | Texas, Below The Surface

04:05
Unaweep Divide, west.
List

Discover Geological Oddities in Colorado

Over 2 billion years of diverse tectonic forces turned Colorado into a playground for the geologically inclined.
Itinerary

6 Ways To See Texas Below the Surface

How to explore the state’s caves, caverns, and fascinating geology.
On the platform.
Lovelock, Nevada

Lovelock Cave

How a bat poo mine became a major Native American archaeological site—and connections to legendary red-haired giants.