Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

The sign at the garden gate reads: “These Plants Can Kill.”

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Paris' linguistic guide to the international language of, yes, love.

This 1920s Dutch barge is now a floating bookstore.

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

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

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

Italian cave with exceptional acoustics and an unsavory history.

According to Greek mythology, this natural spring is the home of a freshwater nymph.

This Elizabethan hedge maze is one of only six in North America.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

This ancient trail climbs the mountain where a Latin League cult worshipped Jupiter, its main deity.

The remains of a town so thoroughly destroyed by French forces that the citizens simply left.

The abandoned "Ghost Mansion" was left to decay in the mountains of Northern Italy.

Stalactites and stalagmites in a beautifully lit cave.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

Cat art as far as the eye can see.

Feast on Middle Eastern mezze from an Israeli expat duo.

Eat the ultimate iteration of Portugal's most beloved pastry.

Since 1969, this restaurant has served up dishes typical of Istanbul's Greek diaspora.

The Lobotesis family has been baking some of the best savory pies in Athens since 1910.