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

One of the holiest places in the region, devotees come to Tirta Empul to bathe in the holy spring water.

This massive complex is made up of hundreds of smaller temples that date back to the ninth century.

Hundreds of Buddhas in a re-discovered Indonesian temple.

Sacred waters rescued from the wrath of a volcano.

This tiny lake temple dedicated to a water goddess seems to float on the surface.

A battle between nature and architecture in the Cambodian jungle.

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

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

One of the world’s most colorful cemeteries, where each pigment is symbolic.

This massive Maya archaeological site is home to the tallest man-made structure in Belize.

An important Mayan religious and trading center dating back to 200 BC.

Engineering ingenuity during the battle of Gibraltar.

Single runway interrupted by a busy road that cuts across its middle.

Touching this 18th-century Scottish philosopher’s toe allegedly conjures good fortune.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

Famously misunderstood wonder of the ancient world

An early masterpiece of Le Corbusier, a famed Modernist architect, hiding in plain sight.

During the French annexation, 36 prisoners were executed using this device.

An opulent monument built for a duke who donated his entire fortune to the city of Geneva.

Where two rivers meet—but don’t mix.

The world's largest second-hand graces a clock surrounded by constantly changing flower beds. 

This famous writer's tombstone is a literary pilgrimage site that was publicly defiled by a rival.

One of the most historical literary characters continues to stroll his hometown.