This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

Breathtaking and huge 430 year old maps of Italy.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Go inside to really appreciate this 500-year-old technological masterpiece.

Underground tunnels once home to crime are now back open to the public.

An abandoned whaling station on an active volcano offers hot springs in Antarctica, surrounded by ruined giants of industry.

This narrow coastline trail through the dense Kauai wilderness is among the most beautiful and dangerous in the world.

Watch the newest land on the planet form before your eyes.

A tunnel of hardened lava along Maui’s famous Road to Hana.

A rare chance to get up close and personal with a 13-mile ribbon of ice near downtown Juneau.

The king of U.S. high points towers over every other peak on the continent.

A trading post in the North Pole where children send letters.

A subterranean house of worship carved right out of the bedrock.

Of five volcanoes located in the massive Tengger caldera, this cone is the youngest and most active.

A sprawling nature preserve harbors the world's only living dragons.

Three wildly colorful calderas top this otherworldly volcano chain.

Where cemeteries are carved into the side of cliffs and infants are buried in the hollows of trees.

The unique funeral practices of the Toraja can be seen here with graves carved into caves and hung off cliffs.

Tubing through a cave lit with glowworms is a magical underground experience.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

The former stronghold of the Malla Dynasty has remained virtually unchanged since the 17th century.