A Gothic cathedral created from volcanic rocks.

The not-quite-incorruptible St. Bernadette is perhaps the most beautiful of preserved saints—with a little help from Paris.

One of the world's most complex timepieces.

Legendary site where an evil bishop was devoured by rodents.

Museum in a swimming pool where the water still flows.

Tiny castle in the middle of the Rhine made you pay to pass.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

The world's tallest boat lift stands as a massive piece of industrial tourism.

A little sculpture with a large wardrobe.

Brussels' favorite peeing boy has a sister.

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

This "floating railway" is one of the world's oldest monorail systems.

The history of sea-faring refuse and disaster is on cramped display in this Netherlands folk museum.

Established in 1638 to battle the Black Death, this botanical garden is a treasure trove of rare flora.

Take a walk in a recreation of ancient Rome.

An amusement park on the grounds of an unused nuclear power plant, with a swing ride inside the cooling tower.

Metro station with a claim to rock n' roll fame.

The "Prussian Versailles" that is as glorious today as when it was built.

Started as a kitchen garden, now the second largest botanical garden in the world.

Super-heavy Nazi architectural experiment.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

Cold war icon and onetime "hole" in the iron curtain.

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

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.