Geography

In the Philippines, you'll find Vulcan Point, an island within Main Crater Lake.
Main Crater Lake is located on Volcano Island.
Volcano Island is located in Lake Taal.
Lake Taal is located on the island of Luzon.
And there you have a lake within an island on a lake within an island.

Iceland, divided by the North American and European tectonic plates, is growing by nearly 5 centimeters per year as the plates grow wider apart.

Mount Everest may be the tallest mountain above sea level, but when it comes to the tallest mountain on earth, that honor goes to Mauna Kea. Above the sea, Mauna Kea only stands 13,796 feet in height. But when you follow the mountain to its base at the bottom of the Pacific, it's 32,808 feet — more than 3,000 feet taller than Everest.

Originally built on a lake in 1325 A.D., Mexico City is currently sinking by about 3.2 feet per year. The Aztecs filled in Lago de Texcoco to create an artificial island, and the Spaniards created a second location atop the ruins in 1521. Because the majority of locals rely on water extracted from the aquifer below the city, it's dropped a total of 32 feet over the last 60 years!

Egypt's Pyramids of Giza may be considered one of the wonders of the world, but Sudan has nearly twice the number of pyramids. Sudan touts 200-255 known pyramids, built for the Kushite kingdoms of Nubia, compared to Egypt's relatively paltry 138 pyramids. Within the Sahara, you can still visit the ancient and reconstructed pyramids of Meroe.