A rare tour of an aristocrat's private home reveals valuable 17th-century paintings from artists like Rembrandt.

This faded sign to nowhere is a beloved icon in New Zealand.

The ruins of an abandoned crematorium haunt an eerie deserted German cemetery.

A quaint Russian village in the middle of a German metropolis.

Gliwice Radio Tower, likely the tallest wooden structure in the world.

A mysterious structure left behind on the Polish mountainside, sometimes called "Hitler's Stonehenge".

This mysterious and once-grand memorial still embodies a remarkable architectural vision.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

This centuries-old wooden wonder was built in less than a year and is one of Europe's largest timber-framed churches.

One of the largest amphitheaters in Europe is a former Nazi gathering place that still stands today.