This massive blockhead sculpture hides an entire library.

This statue of the great Argentinian car driver is located near a famous curve of the Monaco Grand Prix.

This striking sculpture of Icarus honors Greece's fallen flyers.

There are many Byzantine-era churches still standing in Athens, but this is the only one with a 2,500-year-old column rising through its roof.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

Legend says this sacred tree was a gift from goddess Athena.

An ancient octagonal weather station named for the eight Greek gods of wind.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

This ancient statue of Dionysus lies unfinished and abandoned in one of Greece's oldest quarries.

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

A crushed gate and giant bronze head serve as a reminder of Greece's fight for freedom.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

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

A once-glowing grotto at the bottom of Waikapalae Wet Cave.

This blowhole is supposedly caused by a trapped monster.

This ruined fort and statue are a testament to the last king of Kaua‘i’s savvy diplomacy skills, which briefly brought Russians to Hawai‘i.

A former elementary school houses one man's extensive collection of art, artifacts, and taxidermy.