On this Puerto Rican island, many abandoned naval ammunition bunkers sit open while a few have been padlocked by locals as personal storage.

A hugely vast Irish landscape of barren rock that stretches for miles.

Traveling this mountain pass reveals quaint stone buildings, stunning Irish scenery, and a bridge said to grant wishes.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

A massive Montreal stadium that has seen nothing but trouble since its inception.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.

100 massive sculptures in the Hudson River Valley.

A graceful natural rock formation stands astride the point where the Gulf of California meets the Pacific Ocean.

Dating back to the second century, vestiges of prehispanic mural paintings are found in this underground palace.

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

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

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.

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

Deep in the Guatemalan jungle stands an ancient pyramid that once marked the reign of a king.

These roaring primates were considered a divine creature in the cosmology of the Maya.

Monkeys inhabit the lush forest surrounding ancient Mayan ruins once considered sacred.

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

The same water that fills a luxury resort’s pools feeds these free hot springs in the rainforest.

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

In terms of history and architecture, this is one of the most remarkable cemeteries in the world.