The sunlight passing through the opening of this huge cave system creates a magical effect.

A dead saint, a deadly poison, and a mysterious holy ooze.

Macabre symbols of death and mummies on display set the tone of this Italian purgatory church.

The first statue to be added to Saint Peter's Square in over 350 years is an ode to migrants and refugees around the world.

This statue took 60 years to complete.

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

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

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

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

The enigmatic skull gazes out over the ruins of a once-great Mayan city.

A hidden treasure of an abandoned city lies deep in the jungles of Campeche, Mexico.

A monument in the shape of the mighty conch honors the history and symbolism behind this shell.

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

This series of paintings celebrate a locally beloved snail species.

The last street gas lamps in Hong Kong.

This stunning 15th-century royal hill fort preserves the age of chivalry in Rajasthan.

This rare basalt crater lake is used to study the Moon and Mars.

A tall karst islet popularized by 007.

Arguing within this idyllic, circular volcanic lake is forbidden.

When the USA donated cement and funds to expand the airport in Laos, the Laotians built a massive monument instead.

The largest pool at its elevation sits on top of one of the most expensive resorts in the world.

Singapore's landscaping project is home to 18 incredible Supertrees.

One of the world's tallest flagpoles.

This massive collection of taxidermy is full of specimens collected by missionaries during their international travels.