A pocket of Buenos Aires with an unusually high concentration of psychotherapists.

An abandoned Jewish sanatorium is tucked within the woods of Poland.

Oldest Museum of the Netherlands is a true cabinet of curiosities.

Museum preserving torture methods from the past.

This former abandoned hospital, a complex of stunning 19th century buildings, once housed 2,000 psychiatric patients.

After a traumatic encounter with a six-foot eel, one Galway baker started making a daily loaf of sourdough in its shape.

Remnants of cells from the most notorious London prison may lie in the basement of a rare Victorian Gin Palace.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

Artists and musicians now rule over this former rail station.

A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

One of the world's largest collections of pathological specimens.

A network of concealed passageways lies within a busy London Underground station.

London's smallest police station is barely the size of a phone booth.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

The pioneer of psychoanalysis spent the final year of his life here, still seeing patients on that famous couch.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

This cheese shop also houses a museum devoted to Dutch dairy.

The glowing blue Nymphaeum of Emperor Tiberius.

A crumbling watchtower and a lighthouse overlooks the site believed to be the Sirens' cliff in the "Odyssey."

The defensive tower was built centuries ago to warn locals of Berber pirate attacks.

These two strange cones are actually a system of old nautical navigation beacons.

Greenery covers the face of a gently-dripping waterfall deep in the mountains of central Sardinia.