A galaxy of glowworms—larvae of a gnat—hides deep in the belly of these caves.

This Italian dam is covered in salt-hungry goats who manage to scale its almost vertical face.

An almost life-sized elephant named Ms. Ellie greets visitors at this jumbo-themed museum.

Bioluminescent firefly squid light up this Japanese fishing port.

Take a drunken tour inside the world's largest known geode.

A fifth-century temple improbably built into the side of a cliff.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

A hands-off space for graffiti artists to hone and display their skills.

Tubing through a cave lit with glowworms is a magical underground experience.

Natural time capsule containing an alien ecosystem.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

Order scoops of pandan, lychee, and black sesame at this family-run institution.

One person's lost luggage is another person's treasure.

An ethereal glowing blue ocean cave in Croatia.

A natural gas leak provides a flickering flame beneath a waterfall.

Hollowed out cedar log tubs set in an ancient towering forest.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

Stunning wetlands ablaze with pink lotus flowers.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Towering basalt columns, a creation of fire and ice.