Monkeys inhabit the lush forest surrounding ancient Mayan ruins once considered sacred.

Deep in the Guatemalan jungle stands an ancient pyramid that once marked the reign of a king.

Central America's deepest lake is actually a volcanic caldera, surrounded by three volcanoes.

A wall of chewing gum moonlights as collective art.

This quirky hot springs town known to locals as "T or C" was named after a radio show.

The narrow passages will challenge even the bravest driver.

The abandoned village of Skarð aptly illustrates the idiom "Don't put all your eggs in one basket."

The largest lake in the Faroe Islands seems to be held hundreds of feet above sea level thanks to an optical illusion.

This remote island village was in danger of depopulating completely until a tunnel was built to connect it to the rest of the world .

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

An ancient knight and a symbol of the city's freedom.

No one is sure if the world's fourth-largest diamond had been found in a rubbish heap or was pawned by Napoleon's mom.

Legend says if you stick your thumb in the hole and it gets wet your wish will be granted.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A marvel of Byzantine engineering under the streets of Istanbul.

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

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

Where commuters walk through remnants of an ancient Greek necropolis.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

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

Daily jousts and dancing barrel makers in Munich's mechanical clock.

The world's largest wooden structure.

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.