World's largest cave was only discovered in 1991, and now offers tours to the public.

Home to what locals claim is the largest whale skeleton in Southeast Asia, which is worshiped yearly.

Built by the inventor of the radio, this abandoned hotel has housed early radio employees, military men, and a dangerous cult.

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

An unassuming grey box sitting on San Francisco's Pier 17 is a "sky diary" of the coastal city's temperamental weather.

The mysterious round rocks of Schooner Gulch.

A trash dump made beautiful by nature's power.

The long, arduous journey of the stones of the Abbey of New Clairvaux.

A house built from trash known as the poor man's Hearst Castle.

A rotting tree in the middle of Seattle doubles as an elaborately-controlled art piece.

A house filled to the brim with oddities and curiosities.

America's first public mental health facility.

Over 12,000 hygiene oriented objects and exhibits.

A museum dedicated to the exploring past, present, and future innovations.

Medical history museum featuring a lovely doctor's office from the 1800s.

A varied collection of brains in alcohol.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

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

A cluttered and astounding collection of antiquities and curiosities.

A museum in the childhood house of a medical pioneer.

A Hungarian pharmacy museum with a box full of mummy powder.

A monument to the love people have for their pets.