The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

Huge stone depressions which may have acted as an Incan agricultural experiment.

This Peruvian canyon is filled with geometric salt pools that have been being harvested since the Incan empire.

Built on the remains of one the Incas’ most important gathering spots, this square keeps the spirit of a fallen empire alive.

A Christian monastery stands on what was once a holy Incan temple.

A remote candy-striped mountain in the Peruvian Andes straight out of the pages of Dr. Seuss.

A lookout spot for the Andean condor, at the edges of one of the deepest canyons in the world.

This 16th-century monastery was founded to cloister the daughters of wealthy local families.

The Uros people live on floating reed islands in lake Titicaca.

The famed crossbow of Switzerland's folk hero now adorns a restaurant wall

A sculpture of a courtesan towers above Lake Constance, recalling a church scandal.

A Black Forest cuckoo clock theme park features one timepiece big enough to walk inside.

There has been an astronomical clock on this spot since the 14th century.

Explore this medieval cathedral by trying to spot all the malevolent monsters hiding in its beautifully colored windows.

A series of haunting wooden totems are hidden in the woods surrounding a German environmental center.

In the past, Renaissance sex workers were encouraged to entice customers on this bridge.

This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.

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

This ferry carries passengers across the Rhine propelled by no engine or paddles but by the river's current.

This magnificent church allows travelers along one of Germany's busiest roadways a chance to rest and reflect.

This natural hill rose another 130 feet from the debris and rubble added after World War II.

This medieval cathedral houses stained-glass windows featuring saints and pretzels.

A stonemason's hilarious revenge came in the form of this peculiarly positioned gargoyle.