Three bridges straddle a stream, one stacked upon the other.

This enormous "cloth of the conquest" depicts the Norman invasion of England in mind-blowing detail.

Despite centuries of architectural innovation, this French castle is being built like it's the 13th century.

A suspended footbridge allows for traversing this gorge carved through the French Alps.

A factory director designed what was the world's longest suspension footbridge in 1923 so his employees could get to work safely.

Anatomical cabinet holds unexpected treasures.

The first botanical garden, a feather in the cap of the Grand Duke of Tuscany.

This picturesque Umbrian city has a subterranean side that has long remained hidden.

Nine caves filled with recently-discovered archaeological finds under the houses and the streets of the most ancient district of an old town.

Naturally preserved bodies are eerily staged throughout the crypt in varying poses.

Bridge that died in war and was resurected.

There's a mini version of Iguazu Falls hidden in the Balkans, and it's got a rope swing.

65 million-year-old chalk outcroppings mark the end of the Jurassic Coast.

This 135-year-old weather station studied the effects of the climate on human health.

This narrow fjord-like bay is the largest ria in the Mediterranean Sea.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

This tiny town features a tiny town that acts as a 3D snapshot of the town during the 1950's.

In 1943 the British military took control of this village, telling residents they had to leave temporarily. The villagers were never allowed to return.

The origins of a large, medieval castle are shrouded in mystery, but now it's a delightful garden.

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

For centuries no one knew there were hundreds of bones and precious artwork hidden beneath this Swiss church.