The castle that provided the setting for much of 'Monty Python and the Holy Grail' is now a pilgrimage site for fans.

This volcanic plug boasts the longest recorded history of any Scottish stronghold.

This pyramid is dedicated to all those who suffered martyrdom for civil and religious liberty in Scotland.

A striking glass tribute to two sisters who suffered during Scotland's "Killing Time."

The main residence of the Erskine family and the hereditary keeper of the nearby royal Stirling Castle.

These formal gardens were designed to be admired from the vantage point of the castle.

This Georgian mansion blends historical significance with an impressive art collection within picturesque surroundings.

This small, ingenious cannon once helped regulate Parisian life.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

One of Jeff Koons’s largest sculptures and his first commemorative work.

This emotive sculpture was originally created for the 1878 World's Fair.

A beautiful Victorian statue shows France's enduring love of the rhinoceros.

The video game-themed street art first popped up in the French city.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

According to tradition this is the oldest church in Venice, but its actual age is a mystery.

This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.

Two stone columns flank the grand Venice square, but there were supposed to be three.

A sinister pyramid in the Frari contains the heart of the famous neoclassical sculptor.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

Go inside to really appreciate this 500-year-old technological masterpiece.