This electric green sulphur lake in New Zealand looks like a cartoonish radioactive dump site.

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

A giant bird sits atop a tower at one of the largest shopping centers in Brazil.

A jungle in the heart of São Paulo reminds visitors of what Brazil looked like untouched by man.

This somber statue remembers the enslaved women who were forced to nurse their owners' babies.

Ella Fitzgerald, opera singer Enrico Caruso, and dancer Isadora Duncan all performed in this lavish, supposedly haunted theater.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

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

Every equinox this Maya pyramid puts on a spooky ancient light show.

A mysterious, abandoned Chinese building in Mexico pays homage to the area's East Asian immigrants.

If you can look past the nearby sewer pipes, this urban sinkhole grotto is a mini-paradise.

This immense scene of a cosmic battle between a jaguar and serpent illustrates the Aztec concept of the duality of life.

This tiny garden was built specifically to provide a place of peace and serenity away from the busy city streets.

Some charming, but sadly, unloved animal statues call this park home.

The last home designed in its entirety by noted architect Luis Barragán owes its existence to an impressive jacaranda tree.

In Coyoacán, a pair of coyotes crown a public fountain in reference to the ancient Aztec name of the borough.

Come face to face with the ferocious visage of the serpent-headed mother goddess of the Aztecs.

This museum houses two of Mexico's most impressive Aztec monoliths.

Once home to an aristocratic family and a workers' organization, this intricately tiled building now houses a chain restaurant.

These spectacular, symbolic serpents lie within the shadow of the Great Temple.

This colossal ancient sculpture of the monstrous Aztec rain god has a literally stormy history.

Beneath the most controversial monument in Mexico City is a cultural center that exhibits only digital art.

At a museum of everyday objects, it is the act of collecting that is really on display.

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