The patron of this extravagant Art Nouveau confection insisted that nothing less than a boat should project from its facade.

A Cold War command center is hidden under an idyllic countryside.

The Belgian library displays burned books that were salvaged from the fires of both world wars.

The bronzed skull of a beheaded traitor was affixed to the city gate in the 17th century.

Somewhere there is a giant who can no longer poop, but now travelers can stay inside his anus.

The site where one of the most famous poems of World War I was composed is preserved to honor the legacy of the work.

A rare example of World War I trenches from the British front.

A little sculpture with a large wardrobe.

A marble Lucifer hides behind the pulpit of this Gothic cathedral.

This ghost town in Belgium will lose its street art when it ceases to exist.

The Devil’s own choice when he needs a drink in Brussels.

This Croatian island is for sale but no one is buying due to the dozens of accused Nazi sympathizers who were massacred there after WWII.

Formerly Yugoslavia's "forbidden island," this sleepy little city still holds the abandoned remains of military strongholds.

Croatia's towering concrete blossom grows from the site of a World War II concentration camp.

The now-overgrown beach resort was once frequented by Yugoslav military elite.

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.'

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

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

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.

Where the lovelorn find a home for their sentimental keepsakes.

A curious urban windmill once owned by a renowned British mathematical physicist.

When the public was consulted about a new piece of street art, they naturally asked for an enormous metal dragon.