The world's first electric battery-powered submarine.

An impressive display of ships and artifacts from the ancient Mediterranean maritime trade.

An ancient Roman theatre restored to its former glory in the Spanish city of Cartegena.

The bears of Bern have been a city highlight for over 500 years.

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

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

Physicist’s epitaph provides final confirmation to a career of turmoil.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

Op-art architecture designed for happiness.

Baroque celebration of the end of the Great Plague of Vienna.

The topiary maze at the Habsburg hunting lodge.

Legends surround an ancient tree trunk riddled with nails for good luck.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

The final resting place for the remains of 143 Habsburg royalty.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

Once the local rulers had gone these enchanting ruins housed common folk in an almost real life fairy tale.

Building Men of War and Indiamen from Holland's Golden Age.

Its town washed away centuries ago, this lonely tower by the sea tells the tale of a mermaid and a curse.

A miniature city, once ruled by the Queen of the Netherlands.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.