5. Giant Crystal Cave Comes to Light

Crisscrossed with gems up to 36 feet (11 meters) long, Mexico's Cave of Crystals looks like nothing so much as Superman's Fortress of Solitude.

That otherworldly appeal—which helped make the cav
e gallery our fifth most viewed of 2007—is a big reason we still get the occasional email accusing us of propagating a hoax.

See full crystal-cave gallery (originally posted April 9, 2007).

Thats one of National Geographic Top Ten News Photo Galleries of 2007 (and should have been number 1).
Others in clude tiger cat

Mummified Dinosaur

and 8-Foot Giant Catfish