This "City of Books" holds a museum, library, and the complete personal book collections of five of Mexico's greatest thinkers.

The unique collection of gifts includes braids of human hair, a spoon, and a Virgin made of bread.

You can release a young butterfly at this beautiful indoor garden.

Get a privileged view over Mexico City's Historic Center from a terrace right in its heart.

Few of the many visitors to this resort town know of its hidden Maya ruins.

Three sinkholes filled with warm, crystal-clear water reached by a horse-driven cart on an old train track through the jungle.

A series of abstract sculptures pop up from an otherworldly volcanic landscape.

This ceremonial Mexican square looks as though it belongs in a science fiction movie.

This ancient structure was built by a mysterious civilization that was largely destroyed by a volcanic eruption.

Cool down and fill up after visiting Teotihuacán at this bar and restaurant in a deep, underground cave.

The singular ruins of a mysterious lost city.

At least seven hues of blue and turquoise make this freshwater lagoon unique.

One of the few places where you can visit a cenote and Maya ruins at the same time.

A flooded Mexican cave that hides a river beneath the water.

Two waterfalls flow down the cliff faces decorated with rare natural basalt columns.

A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

This beautifully deceptive waterfall is something far different from what it appears to be.

An ancient system of freshwater caves filled with animal bones, including that of species long-extinct.

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.

A quirky and charming restaurant founded by artists.

Meant to be one of the most extravagant hotels in the world, now an eerie, abandoned architectural gem in Mexico City.

High atop a Mexican rainforest mountain, this ancient pyramid once drew pilgrims countries away.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.