Some of the clearest water anywhere in the world.

The astonishing collection of an infamous criminologist.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

A small town Romanian cemetery filled with darkly humorous gravestones.

The spectacular history of spectacles on display.

Have fun at the world's first Buddhist waterslide park.

270 million year-old forest of stone.

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.

The sign at the garden gate reads: "These Plants Can Kill."

A single tree's 2,800 aerial roots give the appearance of a complete forest.

An isolated dive site teeming with cnidarians.

This structure among the trees was the result of divine inspiration.

Cold storage for agricultural biodiversity.

The history of the treatment of mental illness, illustrated in all its gory detail, and housed in an asylum.

Former drug lord’s manor, now a theme park. Watch out for the hippos.

The largest and most famous wax anatomical collection anywhere in the world.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

One of the world's largest Tesla coils.

Japanese company creates clone dolls that reside in the "uncanny valley."

The anatomical-pathological collection of a man who changed surgery.

The only remaining collection of flayed figures made by French "madman" Honoré Fragonard.

This Boston medical museum features the skull of the famous medical case of Phineas Gage.

Tucked behind the Institute of Neurological Science down a decrepit street resides the largest display of human brains in Latin America.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.