A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

Monasteries on rock pillars, once accessible only by frayed ropes.

This demon atop the Notre-Dame de Paris looks utterly bored.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Copenhagen's celebrated theme park and gardens.

A wunderkammer of gold and silver reliquaries and ancient saintly bones.

An ancient knight and a symbol of the city's freedom.

This historic black and white monastery is one of Bulgaria's architectural jewels.

"Holy Wisdom" overlooks the city that became its namesake.

A striking symbol of the Bulgarian capital.

A collection of art from Bulgaria's time as a communist state.

Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.

A naturally beautiful, seemingly bottomless deep blue spring.

Come for the flowers, stay for the bats!

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

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

These ruined Incan mausoleum towers still bear carvings of sacred animals on their blocks.

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

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

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

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

The highest tropical mountain range in the world is in Central Peru, home to a vast array of exotic and quirky plants and animals.

This fortress in Honduras was built to resist pirates, but its builders had more to fear from the British.

A full-size replica of this well-preserved temple lets you take a walk through the Mayan age.