This nearly invisible wire transforms much of the city into one big, symbolic home on the holy day.

This ancient altar emerges from the thick forests to reveal the mysteries of Etruscan sacrificial rituals.

A beautiful riverside mansion where the intellectual life of early-20th-century Argentina flourished.

A surprisingly large and sturdy ruin on the outskirts of a remote village.

Its 27 graveyards represent the many nationalities and ethnic groups that voyaged to this wilderness in the late 19th century.

This isolated structure beckons adventurers with sublime views of the Faroe Islands.

The largest prehistoric cemetery on the Balearic Islands dates back over 2,500 years.

This 50-foot-deep sinkhole created in the 14th century is home to rare plants and fungi.

A spoke-tacular artwork constructed from recycled bicycle rims.

Everyone's invited to put on a miniature concert with this world-class musical wonder.

Hidden behind mountains in Morocco, a remote town hides a thriving surfing community.

A delightful museum devoted to the history of books.

A prehistoric rock shelter that's literally in someone's backyard.

The Jewish section of the famous Boothill Graveyard was abandoned for nearly 100 years.

This historic spot was where America's involvement in the Vietnam War officially came to an end.

A nun spent 16 years painting the stunning Celtic mural that covers the interior of this WWI memorial.

A museum of memories in what was once one of the most violent cities in the world.

A hidden gem of a museum that lets you search for your own fossils.

Clean, cold drinking water flows from a nondescript pipe in a roadside rock face.

The site of the first medieval crusade that pitted Christians against Christians.

This Bogotá museum houses the world's largest collection of pre-Columbian gold relics.

In this brilliant blue spring in Germany, legend has it that a sad mermaid learned to finally laugh.

Nineteen ancient rock-cut Buddhist caves can be found on the outskirts of Mumbai.

One of the largest and oldest caravansaries in Persia.