The childhood home of the Wright Brothers in Dayton.

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

A full figure 4th century incorruptible saint lies in a glass coffin in Croatia.

This scale model of our solar system hid in plain sight for years before a physics team sought out all the planets.

Croatia's "hairy stone" fortress is one of the most well preserved Istrian castles.

Longest fortress system anywhere in Europe.

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

This former estate of a fascist leader is now a burnt out ruin leading to a system of secret tunnels.

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

A wunderkammer of gold and silver reliquaries and ancient saintly bones.

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

Humble beginnings for one of the world's most famous scientists.

When a supermarket opened up shop within a medieval building it became protected by UNESCO on a technicality.

Gargoyle head that brings good luck.

The remains of a sunken military ship wreck visible through clear water.

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

This truly palatial work of Communist-era architecture now sits crumbling on a Croatian beach.

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

Large, airy hallways hide within an impenetrable fortress that beckons urban explorers.

This stunning, out-of-the-way Croatian monument commemorates a community's uprising against occupying fascist forces.

Yugoslavia's biggest underground airport lies in ruins.

A wonderfully strange collection of 500+ stuffed frogs doing people things.

Where the lovelorn find a home for their sentimental keepsakes.

A musical instrument played by the sea.