This impressive working clock made of 16,000 plants changes its flowers twice a year.

The colorful stairs are made with marble from the world's major quarries.

Legend says Dungeons and Dragons players can get their dice blessed at the creator of the game's memorial.

This subterranean studio is filled with fascinating kinetic art.

The dance of this huge clock is a magnificent and eerie commentary on good and evil in the history of humankind.

Colloquially known as “piss alley,” this narrow street filled with tiny bars and barbecue stands looks like it was pulled straight out of “Blade Runner.”

One of the world's most complete mineralogical collections.

This facility has manufactured stunning tapestries for France's royalty ever since the 17th century.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

One of the world's most advanced radio observatories sprawls across the Atacama Desert.

A surprisingly detailed model of the world's most powerful radio telescope.

The Swiss artist's bulbous and overgrown shape-shifting sculpture controversially graces the center of Bern.

A symbol of friendship between the mountainous regions of Switzerland and Bhutan.

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

This amazing pedestrian suspension bridge in the Swiss Alps would give Indiana Jones nightmares.

A cablecar-station-turned-revolving restaurant with 360-degree views of the Swiss skyline.

A historic observatory precariously perched at the "Top of Europe."

A vast and unlikely aviation museum kept alive for over 50 years due to one man's tenacity.

Latvia's symbolic mountain-shaped national library is home to millions of cultural tomes.

Started nearly 100 years ago, this science experiment just keeps on going, ever so slowly.

From Nazi chemicals to the CIA, this architectural marvel has played a fascinating role in German history.

Fantastic views and thousands of love locks.

A rare chance to ride one of the few continuous elevators still in operation.

The sweet story of how American cargo planes became known as "Candy Bombers" during the Berlin Blockade.