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

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.

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

This geometric feat is a testament to the Incas' mesmerizing architectural abilities.

A fascinating little museum all about the rich history of Peru’s famous plant.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

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

A quirky Poe-themed joint on an island keen to celebrate its overlooked connection to the famous writer.

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

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

Erotic art covers the walls of the largest ancient pleasure palace.

Ancient snack bar of the Roman Empire re-opened.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

Medieval torture techniques with a modern conscience.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

The yawning maw of this pagan visage is said to bite off the hands of liars.

As can be expected from a centuries-old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

Rome’s legendary peephole vista is also a former Crusader stronghold.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

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

This was once the home of Gahan's Saloon, Denver's most storied speakeasy.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.