The words of the neighborhood's most famous poets adorn four concrete walls.

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Known for centuries as the famous Roman emperor's burial place, this monument is actually something else.

This gallery commissioned by Cardinal Spada is known for its magnificent optical illusion.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

This is the oldest Roman-made bridge in the city still existing in its original state.

The "Greatest Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

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

2300-year-old Roman road connecting the empire.

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

Venice's "Island of the Mad."

If you’ve ever seen a picture of Machu Picchu, then you’ve seen a picture of Huayna Picchu—you just didn’t realize it.

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

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

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

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

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

Situated on a sacred Inca site, this 16th-century cathedral took nearly 100 years to build.

Haunted by its violent past, this colonial bastion was the largest Spanish military installation in the Americas.

A pretty park of over 1,600 olive trees that grew from just three saplings brought over from Spain.

This stone complex marks the urban center of a lost civilization.

This 17th-century Portuguese fort now houses a nautical museum.

This public elevator links the lower city to the upper city of Salvador.