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

An elegant chandelier hangs over this ancient sewer chamber, now open for concerts and public tours.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

This slumbering beast honors the Bavarian soldiers who died in Greece during a 19th-century typhoid outbreak.

This 13th-century monastery chiseled into the side of a mountain is equipped with a bridge that can be lifted to protect against raids.

Dedicated to the god Dionysus, this theatre was used for both musical and theatrical performances.

This open air archeological site houses almost as much wildlife as it does classical religious artifacts.

Superb sweets await at the first Jewish bakery inducted into Berlin’s prestigious baker’s guild.

The best bagels in Berlin are tucked away in an independent bookstore.

Taste freshly foraged yarrow and black locust blossoms at this ambitious cocktail bar.

One of the largest numismatic collections in Europe fell victim to a huge theft.

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.

A special area of the National Archaeological Museum of Naples is located inside a metro station.

Crammed into several rooms of a Staten Island home, this museum is a vodka-soaked paean to the pleasures of drinking.

The most visited, and possibly most controversial, museum in Germany.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

Rebuilt several decades ago, its striking murals prevent it from being reconsecrated as a church.

Rock carving created 1,300 years ago 75 feet off the ground.

An unfinished complex built for children from around the world sits abandoned on the Black Sea coastline.

This massive stone and steel monument remembers a century-old battle that cost thousands of lives and nearly destroyed the city.

Eastern Bloc nostalgia, anybody?