A circle of stones on a hilltop in Peru’s high jungle, aligned with the winter solstice and largely ignored by archaeologists.

Thousands of volcanic rocks carved 1,000 years ago.

Mystic Incan rock piles three miles above sea level.

Visiting dignitaries and Hollywood stars once stayed at this 1920s hotel, alongside ghosts that are said to haunt its corridors.

This set of mysterious petroglyphs in the Peruvian jungle could shed light on centuries-old activities in the region.

Ancient Peruvian fertility temple or modern money-making hoax? Either way these monoliths still look like penises.

A kitschy Italian medieval-style castle incongruously located amidst one of the most historic towns in the Peruvian Amazon.

Pre-Incan aqueduct amidst a stone forest in Peru.

An abandoned Incan construction project left behind a mysterious "doorway."

A painting in the historic Cathedral Basilica depicts Jesus and his disciples dining on a traditional Peruvian menu.

The mysterious "Candelabra of the Andes" could represent anything from a god's trident to a hallucinogenic plant.

This remarkably well-preserved Incan city managed to survive the conquistadores.

Did Inca children also slide down these smooth rocky slopes above Cusco?

These delicate ruins need more tourists to keep them from fading away.

Extraordinary rock formations in open Peruvian fields.

With nearly double the depth of the Grand Canyon, this Peruvian canyon is one of the deepest in the world.

One of the world's tallest waterfalls wasn't revealed to the world at large until 2006.

White llama terraces dazzle in Peru's "other Machu Picchu."

An unexpected desert oasis in South America.

A medieval fountain lined with 99 unique stone faces whose origins and meaning remain unknown.

A sinister pyramid in the Frari contains the heart of the famous neoclassical sculptor.

The forbidden island of the Tuscan Archipelago may still contain buried treasure.

Cave shrine on Monte Pellegrino.

The small peaceful island off the Venice tourist circuit is where the city began more than 1,500 years ago.