The largest open-air contemporary art center in Latin America is a unique experience in the Atlantic Forest.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

This one has sailed five times as far as Sir Francis Drake's famous ship.

The Metropolitan Police refurbished the blue box (perhaps not coincidentally) the same year "Doctor Who" returned to TV screens.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

Catacombs turned marketplace.

An unusual round church in London with a Templar past.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

This statue celebrating everyday life in Dublin has a few unsavory nicknames.

An enigmatic monument to the Irish revolutionary who plotted an uprising against British rule.

This colorful and fiery mural depicts the Irish folk story of the beloved hero Cuchulain.

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

This neon landmark has been posing this deadpan question to follicly-challenged Dubliners for over 50 years.

The ruins of a medieval monastery named after a type of tree.

The modern birthplace of Irish freedom.

A devastating booze inferno poured through the streets, claiming several victims who drank it.

Oliver Cromwell once seized the land under this house, which included the ruins of a medieval abbey that the owner used to build his stately home.

A proud bronze billy stands as an eternal symbol of Ireland's oldest festival, where a goat is made king.

These imposing walls and towers look more like the ruins of a fortress than a monastery.

Traveling this mountain pass reveals quaint stone buildings, stunning Irish scenery, and a bridge said to grant wishes.