Discover the taste of mold.

Descend into the tunnels to experience the life of a coal miner.

Historic medieval fortified city in southwest France.

This Arab fortress was once the largest citadel in Western Europe.

This enormous censer uses a pulley system installed over 400 years ago.

The chefs at El Diablo use heat generated by an active volcano to cook the food.

Visit a surreal landscape so otherworldly NASA actually used it to train the Apollo 17 crew.

The ruins of an important pilgrimage destination for worshippers of a Maya fertility goddess.

Still standing despite its considerable slant, this tilted lighthouse has become a local symbol of resilience.

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.

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

The former house of an anthropologist couple displays Lacandón Maya artifacts in a homey atmosphere.

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

The stoutest tree in the world.

This small group of sand dunes manages to pack in a strange rainbow of colors.

Réunion Island's highest point is a 2 million-year-old volcano and a paraglider's paradise.

At the center of an island in the middle of the Indian Ocean is a deep chasm ringed by tall waterfalls.

At the foot of an active volcano sits a church miraculously spared by its lava.

Largest lake in Great Britain measured by surface area.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

These 20-foot jaw bones honor a time when the leviathan bones were a sign that whalers survived the hunt.

Unusual British home built to disguise a water tower.

This narrow Ghent alleyway is an officially sanctioned street art tunnel.