Seventeen oak trees sprout from the roof and walls of this tiny chapel without any visual evidence of roots.

A somber memorial at the site where hundreds of prisoners and civilians were executed in the aftermath of World War II.

The nuns here cultivate silk to weave some of the finest scarves in the world.

The Greek War of Independence was declared at this medieval Byzantine sanctuary.

This spectacular track has run continuously since 1882.

A collection of over 15,000 zines works to preserve DIY publishing culture.

An innovative local park built from an abandoned sewage treatment plant.

The historic building has preserved human organs, unusual hexagrams, and scars from a political assassination.

Step inside an ancient beehive tomb built for a mysterious cult hero.

This 18th-century former mosque held the first Hellenic Parliament.

The site where a nuclear bomb was lowered over 8,000 feet underground and detonated as an experiment in natural gas extraction.

A coal fire has been burning underground here since 1896.

Hollywood's oldest hotel is the site of the first Academy Awards, the birthplace of Marilyn Monroe's career, and the home of Montgomery Clift's ghost.

One of America’s oldest and spookiest hotels, thanks to the residency of ghosts, dead presidents, and Alfred Hitchcock.

At the time of its completion, it was the tallest dam in the world.

The oldest standing Byzantine church in Athens is tucked within a monastery in the middle of an upscale shopping district.

This small chapel holds the mummified heart of one of the heroes of the Greek Revolution.

Scars of this building's past life as a violent prison still cover its walls.

This striking sculpture of Icarus honors Greece's fallen flyers.

This graffitied 19th-century building was a prototype of European industrial architecture.

This historic structure has been used as a mosque, a barracks, a prison, a school, and a bakery.

Legend says it was constructed with the destroyed pillar of an ancient Greek Temple.

This popular cave pool is truly magical, despite the crowds.

Found down a long dirt road, a sacred Mexican cenote and 18th-century hacienda remain hidden.