Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

An awe-inspiring mosque in Morocco with one of the tallest minarets in the world.

Morocco’s modern capital was once a haven for Barbary pirates, who went so far as to establish a republic of their own.

Dramatic river bend surrounds a natural red-rocked pedestal.

This mesmerizing and surreal landscape features intricate patterns of white and red sandstone.

Take a hike to this remote, scenic tea stop in the Canadian Rockies.

Setting this massive marionette aflame rids Santa Fe of doom and gloom for another year.

These Pre-Columbian petroglyphs contain representations of birds, deer, hunters, and even some early Native flute players.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

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.

Central America's deepest lake is actually a volcanic caldera, surrounded by three volcanoes.

The colonial city's social history is reflected in its fanciful door knockers.

This elegant Colombian fortress was one of the torture headquarters for the Spanish Inquisition.

An ancient city hidden in the heart of the Sierra Nevada mountains.

An impressive display of ships and artifacts from the ancient Mediterranean maritime trade.

An ancient Roman theatre restored to its former glory in the Spanish city of Cartegena.

Hidden underground, a remarkable 10th-century bath complex survives virtually unaltered.

An iconic and controversial ancient Iberian funerary urn with a hauntingly penetrating gaze.

A 5,000-year-old city in Peru holds the remains of a stunning set of astronomically-aligned pyramids.