This disused VLF radio station is no longer in service but the surrounding town still bears its name.

The place where houses are born.

An abandoned sanatorium building from the early 20th century sits in the forest of the Rila mountains.

A crumbling monument to a now locally-extinct sport in Bulgaria's oldest ski resort.

An abandoned saucer-shaped monument in the Bulgarian mountains.

This sprawling Belgian fort was once thought of as impenetrable but now it is simply an abandoned relic.

The private train station King Leopold II built for the Belgian royal family now lies abandoned.

Underneath a chalk hill in France lies what Hitler hoped would be the underground launching base for a devastating new weapon.

Descend into the tunnels to experience the life of a coal miner.

What was once a bustling mining installation is now a bustling hub of contemporary art.

Artwork tucked within the trees greets visitors with surreal sonic experiences.

This former coal mine, now a fascinating museum, was the site of Belgium's worst mining disaster.

This bunker in northern France was built by Nazi German forces with the intention of launching up to 50 V2 rockets at London each day.

This disused boat elevator was saved from the scrap heap so that visitors could tour its rusting skeleton.

These crumbling Nazi artillery bunkers are now fair game for massive graffiti projects.

A massive, gleaming sea turtle with a rider atop its shell looks out over the horizon.