Countdowns

Lasers have helped uncover ancient human-made structures the world over.

Want to experience totality again? Here are the next seven total solar eclipses across the world, from Alaska to Australia.

Archaeologists have discovered lavish and grisly burials the world over.

From "diamond rings" to Baily's beads, here's what to look for today during the brief darkness within the path of totality.

On Pi Day (March 14) we celebrate perhaps the most iconic irrational number on Earth. From its ancient origins to the unanswered questions, here are some of the most surprising facts about pi.

Here's why ancient Egyptians buried their dead with certain grave goods, such as the "Book of the Dead," gold tongues and scarabs.

Reference Google Earth and satellite imagery has revealed some strange things, from secret military bunkers in China to phantom islands to a mysterious pentagram in Kazakhstan.

From the the Ark of the Covenant to the crown jewels of Ireland to a 333-carat pink diamond, here are 30 of the world's most valuable (and missing) treasures.

Modern humans are far from the only species in the Homo genus. Here are others that went extinct long ago.

Find the perfectly camouflaged animals in all of these photos.