Artworks by loners, prisoners and the criminally insane.

This simple apartment may have inspired some of the most important theories in the history of science.

One hundred years ago this small house in downtown Zürich became the birthplace of the Dada movement.

A once-thriving hotel in the Swiss Alps couldn't compete with climate change.

Traversing steep Alpine slopes, this engineering marvel is one of the longest and highest funiculars in the world.

A historic observatory precariously perched at the "Top of Europe."

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

A cylinder monument with a spectacular vista commemorates a friendship that some say never existed.

Take respite inside this jaw-dropping church while climbing the volcano where Georgia's Prometheus was once chained.

The charmingly disheveled clock tower of Tbilisi's puppet theater.

Rock-hewn monastery complex with hundreds of cave structures tucked away into the mountainside.

A space dedicated to contemporary art and culture, co-chaired by fashion icon Miuccia Prada.

Da Vinci's equestrian statue, 500 years in the making.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

Scores of wax baby figurines add an unusual mood to this beautiful church on the Greek coast.

This architecturally eclectic early-20th century mosque was built as a place of worship for the Islamic followers of a Jewish messiah.

An abandoned Byzantine fortress and notorious prison.

A two thousand year old brothel uncovered in Northern Greece.

These ruins in Volvi were once at the intersection of the Eastern and Western Worlds.

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

Where commuters walk through remnants of an ancient Greek necropolis.