A historic observatory precariously perched at the "Top of Europe."

The steepest classic funicular in the world glides along a dizzying incline.

These spooky and unusual stone formations create an underworldly landscape.

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

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.

A magical sinkhole on the Yucatán Peninsula is adorned with mini waterfalls and hanging vines.

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

It would take you approximately an hour and a half to walk to the end of Mexico's largest pier.

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

In this breathtaking canyon, crocodiles bask on boulders and glide through the murky waters.

The masses at this church incorporate enough moonshine and animal sacrifice that they are no longer recognizably Catholic.

This dazzling Buddhist temple was constructed from over one million ceramic tiles salvaged from a British shipwreck.

Limestone caves in the Cambodian countryside, once the site of genocide, now a place of peaceful beauty.

Though it was originally dedicated to the Hindu god Shiva, Baphuon was converted to a Buddhist temple in the 15th century, complete with a massive hidden statue.

Bombed and burned, this monument represents the often controversial ties between Vietnam and Cambodia.

The river depicted in the antiwar film 'Apocalypse Now' was likely based on this Mekong tributary.

This often-overlooked ocean walkway was once considered an impossible fantasy.

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

The splendor of this 17th century golden chapel has led it to be called the "eighth wonder of the world."

The first public library in the Americas has more than 45,000 books dating back to the 15th century.

This exquisite example of early colonial architecture remains unfinished almost 500 years after construction began.

These sacred Mesoamerican ruins feature peculiar petroglyphs hidden in the stones.

Paris' linguistic guide to the international language of, yes, love.