The Grand Mall in Varna hosts one of the biggest collections of Soviet-era paraphernalia in Bulgaria.

These abandoned Cold War-era bunkers are now a designated refuge for endangered bat species.

Amalfi's pre-industrial history is slowly being engulfed by the lush vegetation of the Ferriere Valley.

The world's first and only museum dedicated to dachshunds.

This natural "sea of stones" was once used by the Romans as a quarry.

Destruction from Armenia's 1988 earthquake inspired an artist's sculptures of scrap metal.

In northeastern Poland, the ruins of a massive granary overlook the Narew River.

This remarkable parking garage in Darmstadt has lived several lives and still contains remnants of its World War I past.

This old, abandoned hotel offers magnificent views.

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

A unique museum dedicated to culture and artistry of carpet weaving.

The last of three massive blast furnaces that were once at the foundation of the Port of Sagunto economy.

Two standing giants remain as a tribute to Luxembourg's metallurgical past.

The sinister ruins of one of the worst dam failures of the 20th century lie in this astonishing alpine setting.

This highrise residential building looks mundane, but hides a water tower and WWII bunker.

This small corner bar is home to a rare 1930s dance organ that still plays tunes for one Euro.

After visiting hours, this picturesque waterfall is essentially turned "off" to be used for hydroelectric power.

This ancient monastery complex was transformed from an island to a peninsula when the lake was partially drained.

Squeezing inside this deep, narrow canyon reveals a festival of desert colors.

The entrance to this Frankfurt subway station looks like an old tram car crashed into the concrete sidewalk.

One of the most easily accessible examples of the rare 1960s UFO houses.

An 11th-century medieval castle cascades over the town of Numão.

An early 20th-century sanatorium, long abandoned and now being reclaimed by nature.

In the late 1990s, a mechanic and fan bought this iconic sportscar back from the dead.