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

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

Experience what life was like in Ireland during the Viking and medieval ages.

The oldest public library in Ireland.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

Cat art as far as the eye can see.

The largest collection of handbags in the world, the oldest of which were used to carry Bibles, primarily by men.

Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

Amsterdam's former hotspot for public executions and dissections.

The attic of a four-century-old canal house hides a clandestine church.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

Replicas of Apollo's leonine stone guard cats still line a sacred row in Greece.

Giant marble phalluses on the sacred island of antiquity.

This ancient statue of Dionysus lies unfinished and abandoned in one of Greece's oldest quarries.

The hallucinogenic center of the ancient world.

The ruins of an abandoned medieval city where the last Byzantine emperor was crowned.

This 15th-century island fortress later served as home to the executioners no one wanted to live near.