A small but immensely extravagant palace built by the "Night King."

"The most colorful grottoes of the world.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

An intricate and amazing house built by architect Karl Junker.

When the rain falls, this drain system turns into a musical instrument.

A striking 12th-century-style castle built on the edge of a cliff.

A wunderkammer of mysterious objects and stories.

Art and a pun, all in one.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The fairy tale castle of the "fairy-tale king."

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

Where beer lovers can literally immerse themselves in beer.

The haunting complex honors the millions of Ukrainians who died in the forced famine under Soviet rule.

At this museum in Iceland, visitors can sample fermented Greenland shark.

Nikola Tesla's former home contains an homage hidden from plain sight.

Hidden beneath a restaurant, underground tunnels tell the story of Malta’s tragic role in World War II.

Amidst medieval and baroque buildings, five human-sized gherkins stand tall.

Step into a cartoon at this Seoul café that aims to evoke a two-dimensional scene.

The dining hall that nourishes workers in Chernobyl's Exclusion Zone is also open to visitors.

From sax to spuds, get 'em all at this landmark music establishment.

The first privately-owned space capsule to orbit and land carried a secret payload: a wheel of Le Brouère.

Men and special assistants stand by the road to sell the day's catch in this lakeside village.

A 22-million-year-old sandstone cave is a natural habitat for award-winning cheese.