This viaduct was based on designs by Gustafe Eiffel

This ancient canal may have been dug by the Romans for navigation but was used for drainage by James I's engineer

In the right conditions a wall of water up to five feet tall flows upstream against the current on the River Trent.

This little-known hero has been protecting "The Fens" for close to 400 years, and now from its most powerful challenger yet: climate change.

A collection of iconic aircraft from WW2 based at a front line fighter airfield and flown by the luckiest pilots in the RAF.

The longest and tallest aqueduct in Britain can actually be sailed across.

Monuments and plaques commemorate the local man whose invention shrunk the world.

Some of England's last cave dwellers lived and worked within this huge cave.

The link between these two seemingly disparate themes is crucial to the history of this Tuscan hill town.

The only substantial part of Nazi Germany's formidable defensive line through Northern Italy that survives today, largely intact.

The underground sanctuary of a mysterious ancient cult.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

A sculpture serving as an homage to Pope John Paul II.

The "Great Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

An Italian geologic wonder that served as the inspiration for the landscape of Dante's hell.

This Tuscan lake hides a 13th century town that is still visible when the water recedes.

A memorial to Brazil's little-known role in World War II.

The towering Pinocchio stands 63 feet tall in the Italian village his creator frequented as a child.

A stunning bridge that appears as if it's lunging to the shore, and has a legend of a devilish architect.

Walk through a fairytale in Tuscany.

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

This elaborately decorated wall is an homage to the history, beauty and lore of the palm tree.

A celebration of solstice followed by a fiery purging of evils.