The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

There has been an astronomical clock on this spot since the 14th century.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

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

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

305 homemade stone stairs wind their way up the Hamilton escarpment.

Canada's oldest sugar maple has been growing since around 1500.

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

Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

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

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

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

Museum preserving torture methods from the past.

These ruins are a hidden gem, complete with fantastic views over the cliff edge.

This was once a hall in which a 16th-century royal banquet was hosted by King James VI of Scotland.

The United Kingdom's smallest working cathedral also serves as a quaint bed and breakfast.

One of two Irish-style round towers in Scotland, this structure has mysterious origins.

The artwork is tucked within a cave on a tiny Scottish island only accessible at low tide.

A British plaque explains that a house was built using the spoils of the first international golf bet.

The location of this historic castle was inspired by a donkey.

This charming old building's loose connection with the Scottish Reformer is what saved it from demolition after it split apart.

Fifty years of contamination in Scotland's waters.

These ancient sea caves hold Britain's highest concentration of Pictish rock carvings.

This tiny island is home to the world's largest colony of Northern gannets.