Ancient paintings known as the "Sistine Chapel of Cave Art."

Ancient snack bar of the Roman Empire re-opened.

Breathtaking and huge 430 year old maps of Italy.

The world's oldest known salt mine.

Hiding the longest subterranean river known in the world.

Macabre astrological automaton clock dating to the late 1400s.

Fortified homes of highland warriors that are still in use today.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

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

World's most expensive home.

A beautiful geyser under environmental threat.

The glowing blue Nymphaeum of Emperor Tiberius.

The only pollutant in the clear blue water is sunscreen.

A sharp bend in a dramatic river canyon cut through red rocks.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

WWI hospital ship lost in a cyclone turns up on the coast of Fraser Island, where she remains rusted and forgotten.

The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.

Swarms of dainty flying insects swarm into the Petaloudes Valley to get busy.

A battle between nature and architecture in the Cambodian jungle.

5,000 skulls in memorial to those killed by the Khmer Rouge.

Bangkok celebrated its shifting monarchy with a militaristic homage to democracy.

Largest cave system in Africa.

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

Roman ruins, natural methane fires and a lovely beach.