A tower marking the spot where Yugoslavia began its resistance against the invading Nazis stands neglected, but not quite forgotten.

This exquisite example of early colonial architecture remains unfinished almost 500 years after construction began.

This picturesque medieval monastery guards a small trove of historic treasures.

An ethereal glowing blue ocean cave in Croatia.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

A musical instrument played by the sea.

This Croatian fairytale castle is slowly falling apart thanks to years of neglect.

Legend has it fairies gathered at the site of this medieval castle.

Now abandoned, the world's first torpedo factory is crumbling into the sea.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

The complex has been abandoned since the Croatian War of Independence, barring a stint as a set for 'Game of Thrones.'

Longest fortress system anywhere in Europe.