These gigantic skeletons tower over visitors and provide insight into the creatures that once ruled over Ireland.

Once the home of the Doge of Genova this palace, now restored as a cultural and arts centre, has two very different facades and entrances which originate from its complex history.

A masterpiece of modern architecture that caused quite a stir in Paris, recreated in Bologna half a century later.

If you ever wanted to touch a medieval mercenary’s three testicles, look no further.

The middle finger of modernity.

A massive engineering and hydraulic marvel dating back to the 3rd century BC

An iron dragon with a long neck covered in feathery scales perched above one of Venice's most popular squares.

According to the local folklore, the myriad colors of this lake are the result of a lovelorn wizard's blunder.

The world's tallest circular building is loaded with symbolism, but many just see a big donut.

What appears to be an ancient Roman temple is actually a Catholic church.

Medieval streets buried beneath a papal fortress now form an underground city you can walk through.

The entrance to this Frankfurt subway station looks like an old tram car crashed into the concrete sidewalk.

Somber memorial to the May 10, 1933, book-burning which took place on this spot.

This 18th-century fort surrounded by a moat was used to store gun powder and ammunition, and now sits in the middle of a large park in Dublin.

This bridge was constructed from the rubble of the infamous Bastille.

Paris' fabled purveyor of exotic taxidermy and natural history curios.

Original cabaret handbills, posters, and feline artwork are a purrfect highlight of the Museum of Montmartre.

A fairy tale castle in modern Rome.

Nicknamed “The Mushroom,” this unique water tower has been featured in several iconic movie scenes.

The modern birthplace of Irish freedom.

A former fortified tower now houses a collection of classic communications equipment.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

The remains of an ancient Roman city are hidden underneath Bologna's beautiful public library.

Hilltop garden on the site of an old fortress overlooking the Mediterranean Sea.