A sacred lake composed of over 300 separate pools of highly concentrated minerals.

An opal mining town in the middle of Australia where people live, worship, and shop underground.

Hauntingly beautiful totem poles left by the Haida.

A New England ghost town features a trail of boulders etched with intriguing life lessons.

Modern-day cave dwellers carve elaborate homes out of volcanic debris.

The only remaining Jewish congregation in Greenpoint.

Remote town home to Himachalis, Israelis, and tons of hashish.

Most polluted lake in the world, used as a radioactive dumping ground for years.

This extraordinary geological oddity resembles human-made pavement.

This unique exhibit "Dialogue in the Dark" reverses roles as the visionless become guides and the sighted become ‘blind.’

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Blackfoot petroglyphs of southern Alberta which date back as far as 7000 B.C.

Traditional 11th-century outdoor tannery.

First mosque in Canada, second in North America.

Abandoned village in Sicily built during the agricultural reforms of Mussolini.

Burial mound for the ears and noses of thousands of mutilated Korean soldiers.

Oldest synagogue in the United States.

Roman ruins top white travertine terraces formed by ancient hot springs.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

Morocco's largest Jewish cemetery.

Sleepy fishing port not included on many maps.

A community of collapsing homes more than a mile out from the Florida coast.

At 8,000 feet, the world's highest tea estate draws visitors for both its products and its panoramic views.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.