Slovenia's first mosque is a striking mix of Islamic and modernist architecture.

A whimsical bridge adorned with decorative dragons.

A trough of 700 strange bronze faces runs through a narrow alley in Ljubljana's old town.

A public work of art that also provides some relief from the summer heat.

Martin Bricelj Baraga's monolithic sculpture measures the blueness of the sky, and changes color to match it.

A small marionette collection located within the dark cellars of an 11th-century Austrian castle.

This strange statue features a bust of the famous composer plopped atop a woman's body.

The world's oldest known salt mine.

This one-time health resort was used by aristocrats around the world.

A fearsome dragon clings to a corner of Munich's city hall.

Some 80,000 Delft Blue tiles line the inside of this Amsterdam walkway.

Amsterdam's former hotspot for public executions and dissections.

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.

The tallest building in the Republic of the Congo is a source of pride despite its towering maintenance costs.

A crypt believed by many Congolese to be a center of black magic.

Soon after its unveiling, this giant inverted globe sparked controversy and was vandalized.

At almost 1,000 years old, this is the oldest known door in all of Britain.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

A friendly pub with a sordid past in cock fighting.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.

This long-hidden space above Westminster Abbey now displays the battle gear of the legendary King Henry V.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

This marine reptile was discovered by one of the 19th century's greatest fossil hunters.