Once a place of peaceful repose, this sanitarium now faces an uncertain future.

This semi-spooky remnant of an abandoned hotel provides fantastic views.

An eighth-century rock-cut cave temple in the middle of Pune.

This abandoned Victorian-style house was built in 1884.

The top of society once luxuriated in this world-class hotel, which continues to impress, even in ruin.

Fortifications built for a Soviet invasion that never came now sit abandoned in a losing battle against nature.

An abandoned castle owned and ignored by Masons carries a cursed history.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

A beautiful 19th-century mansion slowly crumbled and became a 'ghost house' after World War II.

Was this cave created by Hercules's wrath, the devil, or volcanic activity?

This castle was once considered as an option for the Royal Family's alternate residence, but you may know it better from the 'X-Men' movie.

This secret collection of the strange and occult was rediscovered in a forgotten room of an old house.

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

Also known as "Hell Alley," this tiny street in Imola gained its name in a bloody episode in the 16th-century.

This Elizabethan hedge maze is one of only six in North America.

Folklore says this medieval fortress was plopped atop a portal to hell to trap the demons below.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

The most powerful waterfall in all of Europe.

This modern monument to pagan belief looks like it was transported straight from ancient times.

This elegant arc of a waterfall marks a religious turning point.

Iceland's "Smoky Valley" is a beautiful river that is shrouded in a constant cover of steam clouds.

Strange rock formations tower above the river that snakes through this enchanting Icelandic canyon.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

This fantastical waterfall is hidden in a cave located in a cracked cliff.